Gmc acadia shakes when accelerating

justfishin99 Discussion starter. 14 posts · Joined 2023. #1 · Mar 28, 2023 (Edited) I have a 2008 GMC Acadia SLE - AWD. What would cause a vibration like noise from driver rear of vehicle between 2000-3000 rpms and only while in drive? If I’m accelerating and the noise occurs, I can push it into neutral and it stops. Speed doesn’t …

Gmc acadia shakes when accelerating. If you’re in the market for a new or used GMC vehicle, finding a reliable dealership near you is crucial. Whether you’re looking for a spacious SUV like the GMC Acadia or a powerfu...

Service type. Engine is shaking, pulsating or vibrating Inspection. Estimate. $99.99. Shop/Dealer Price. $110.24 - $117.94. Show example GMC Acadia Engine is shaking, pulsating or vibrating Inspection prices. Any unusual shaking or vibrating forces coming from the engine is cause for concern.

Jun 1, 2017 · 51 posts · Joined 2011. #1 · Jun 1, 2017 (Edited) Hi Everyone, My Acadia has started to rock side-to-side (left/right) at highway speeds (> 60 mph / 100 kph). It is a 2009 SLT1 (18" wheels) with 65,000 mi / 105,000 kms. Any ideas as to what could be the problem? P0700 is a common code if it’s an electrical issue related to the transmission. If something has gone wrong in the transmission, your Acadia may not be able to accelerate anymore, or it’ll. If it can no longer shift, it could be caused by a solenoid/valve body that has gone bad, clutch packs, debris, and much more.This bulletin replaces PIT5771B. Please discard all copies of PIT5771. Some customers may comment that a Wobble/Vibration occurs on hard acceleration (WOT) around 48 to 112 km/h (30 to 70 mph). This condition may be caused by driveline vibration. Important: This bulletin is to address the above scenario ONLY.Invest in Kanchipuram – multiply your investment and build your future home close to the Next New Greenfield Airport near Chennai. Kanchipuram and its surroundings are …Cooke Discussion starter. Yes it is an AWD and it has 119000 miles,the noise happened 1 time about 4 weeks ago and didn't do it again for about 3 weeks and now it does it daily when you turn and slight acceleration there's a clunk in the rear end you can feel through the floor board,I removed the tire and everything seems to be tight and in ...

The reason your GMC Terrain shakes at idle but smooths out when accelerating is that the engine is spinning faster, which smooths out any misfires. If a motor mount is causing the problem, once you put the vehicle into gear, the torque from the engine will hold it against the frame. It can be very jarring when your GMC Terrain shakes when …I started chasing a shudder that occurred during acceleration, usually between 25-40 MPH, about 2 months ago. Goodyear told me it was due to a bad upper …I too have a vibration starting about 60 but can be drove out about 70 plus. transmisson rebuilt, new tires aligment and road forced balance. all done at dealer and under warranty it a 2016 Acadia awd. I am very concerned. called GM said to take it another dealer second opinion. after running several test said its the nature of the …Bulletin No.: 20-NA-227. GM bulletins are intended for use by professional technicians, NOTa "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools ...Can meal replacement shakes help me achieve my wedding weight-loss goal? Visit TLC Weddings to find out if meal replacement shakes are the way to go. Advertisement Can meal replace...11 posts · Joined 2007. #1 · Oct 23, 2007. Hi. I have a vibration problem with my Acadia SLE AWD. There is a noticable vibration through the accelerator pedal between 1600 and 2000rpm, and sometimes when pushed (i.e. overtaking, going up hill) this vibration (and noise) increases and shakes the entire dashboard for a short period of time.The reason your GMC Terrain shakes at idle but smooths out when accelerating is that the engine is spinning faster, which smooths out any misfires. If a motor mount is causing the problem, once you put the vehicle into gear, the torque from the engine will hold it against the frame. It can be very jarring when your GMC Terrain shakes when …1705 posts · Joined 2015. #2 · Jul 20, 2019. A rattle or clatter sound like drawing a stick across a picket fence on hard acceleration could be preignition spark knock from low octane gasoline. Change gasoline supply or try higher octane and see if it makes a difference. Current Chevys -'19 Silverado RST;'18 Malibu LT Redline;'18 Traverse ...

The cheeseburgers from New York City's Shake Shack are so beloved by burger aficionados that even 12-hour Manhattan visits demand a wait in the Shack's imposing line. One burger lo...Only happens when accelerating lightly under load. If you hold that speed under load it continues. The steering wheel shakes, but feels transmission related to me. …The Accelerated Cost Recovery System (ACRS) is a depreciation method that assigns assets periods of cost recovery based on specific IRS criteria. The Accelerated Cost Recovery Syst...Without any mechanical knowledge, get it to a shop for an estimate. Clunks usually mean a mount is not tightened or broken. Could be motor mount, suspension bushing, etc. One way to check for motor mount is to put it in gear, press hard on the brake, and hit the gas. If it clunks, then your motor mounts need replaced.11 posts · Joined 2007. #1 · Oct 23, 2007. Hi. I have a vibration problem with my Acadia SLE AWD. There is a noticable vibration through the accelerator pedal between 1600 and 2000rpm, and sometimes when pushed (i.e. overtaking, going up hill) this vibration (and noise) increases and shakes the entire dashboard for a short period of time.

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1. Misfire. Vehicle Speed: A Misfire can be felt at any speed, but is most noticeable at low RPM. A misfiring engine is one of the most common reasons your Yukon will shake when accelerating. A vehicle’s ignition system consists of spark plugs, coil packs, and maybe plug wires.airforceone Discussion starter. 95 posts · Joined 2013. #1 · Dec 14, 2013. I am feeling a transmission shudder if driving at 20 or 43 MPH with my 2007 Acadia. Once you pass through those speeds the shudder stops. Those speeds coincide with the new GM transmission calibration: From 2 to 3rd gear at 20 MPH and from 4 to 5th gear at 43 MPH.Low RPM Shudder/Vibration. On my 2012 Avalanche with 5.3l and 6-speed AT, I experience an intermittent shudder between 1,000 and 1.500 rpms. I sometimes notice it in lower gears at low speeds, and it happens on the highway for a couple seconds at a time pretty regularly if I'm cruising around 1,500 rpms. If I drop to 5th gear and get to …1. Erratic shifting. One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. If the downshift solenoid has any issues, it may cause the vehicle to behave erratically when downshifting. A bad or failing solenoid may cause the vehicle to experience hard or erratic shifting when slowing down or coming to a stop.Acadia Fluxuating RPMs. Within the last month my 2012 Acadia has starting having fluctuating RPM's when driving at a constant speed roughly between 50-60 MPH (1500 RPMs +- 100 RPMs). The shop I took it too said the spark wires were good and cleaned along with a throttle body cleaning. They did say the Acadia was randomly …

The GMC Acadia’s six-speed transmission is the subject of recalls and TSBs for serious failure and unreliability in 2007-2017 models. 2007-2008 Acadias experience early transmission failure, 2009 models suffer from broken clutch plates and hard shifting, while 2013 and 2017 years are plagued by faulty solenoids and shift to park …Only happens when accelerating lightly under load. If you hold that speed under load it continues. The steering wheel shakes, but feels transmission related to me. …There are plenty of businesses that sell candles. Here is how Intentions By Christina is shaking up the candle business. There are plenty of businesses that sell candles. But Inten...It's absurd that the entire vehicle should vibrate/shutter at 45mph and continue to do so as long as you maintain that speed. I'm hopeful that GM can figure out what to do about this problem. [/quote] Charlene, maybe you might want to try calling Lemay [262-694-1500], dealership in Kenosha, and make an appointment.Hi, My truck just recently started to vibrate like it is going over rumble strips. It only happens over 40MPH and sporadically. It seems to happen when I’m just giving enough gas to maintain speed. Once it starts if I let off the gas or give it more gas it goes away. It reoccurs anywhere from 20 seconds up to a few minutes. I’m afraid my tire is going to fly …2618 posts · Joined 2010. #4 · Jun 23, 2012. Re: vibration and jerk Before shifting 2-3 ( Acadia 2007) help me. SEEMO said: GMC Acadia car 2007, I have a problem in the shifting Transmission, the speed of 60 kilometers, Before Transmission , it gets vibration and jerk then its gose ok. I am very far from the Agency, and has to know …1. Misfire. Vehicle Speed: A Misfire can be felt at any speed, but is most noticeable at low RPM. A misfiring engine is one of the most common reasons your Terrain will shake when accelerating. A vehicle’s ignition system consists of spark plugs, coil packs, and maybe plug wires.14 Vehicle Shudder problem of the 2008 GMC Acadia. Failure Date: 09/15/2014. During acceleration the vehicle vibrates when going between 35 and 45 mph. Was not able to reproduce issue at dealership last fall, but is now getting much worse. Happens almost everytime the vehicle accelerates.wheel giving you a hand massage? heres whyOf of the metal clutch discs in the clutch pack will wear out due to excessive heat, and the transmission must be rebuilt or replaced to correct the concern. Again, diagnosis is a must, just letting you know one of the issues that circulates about this transmission. Shudder seems to correspond to acceleration but also seems to occur right ...

GEORGEC. 1755 posts · Joined 2010. #7 · May 19, 2021. Years ago I owned an Acura MDX that had a vibration on slow speed left turns. The dealer said new rear differential at $3,000. My independent mechanic said there was a Tech Bulletin that said change the fluid. $64 later and a fluid change and the problem was solved.

RPMs drop and jerking while accelerating. hello everyone,i have GMC acadia 2008 and it has 200,00 kilometers . it drops RPMS from 2500 to 1500 at the speed of 40 to 50 miles/hour while accelerating... starting and initial running has no problem, but after reaching ( i guess 5 and 6th gear ) if i take the foot off the Accelerator pedal ,and ...Vehicle Speed: A Misfire can be felt at any speed, but is most noticeable at low RPM. A misfiring engine is one of the most common reasons your Charger will shake when accelerating. A vehicle’s ignition system consists of spark plugs, coil packs, and maybe plug wires. If it is an older model, it’ll have a distributor and coil instead of ...Cause 1: A blocked fuel filter (or poor fuel pressure in general) Engine misfire is a common cause of car shakes, especially if it happens when you push on the accelerator. This can often be caused by a lack of adequate fuel pressure in the cylinder. Sometimes, a lack of fuel can be caused by a blocked fuel filter that hasn’t been changed …I have a 2017 Acadia Denali with ~133,000 miles. About two months ago I noticed a jerking/shuddering at highway speeds, generally between 50-65mph. This only happens under light acceleration or cruising up a slight incline. If I let off the gas or accelerate harder it goes away.11 posts · Joined 2007. #1 · Oct 23, 2007. Hi. I have a vibration problem with my Acadia SLE AWD. There is a noticable vibration through the accelerator pedal between 1600 and 2000rpm, and sometimes when pushed (i.e. overtaking, going up hill) this vibration (and noise) increases and shakes the entire dashboard for a short period of time.8 Causes of Car Shakes When Accelerating. The most common reason why a car is shaking or vibrating when accelerating is due to unbalanced wheels or a worn CV joint. It can also be a damaged driveshaft, but it could also be caused by engine issues like a misfiring engine. Here is a more detailed list of the most common reasons why a …He has more than 3 decades of stem cell research experience with 15 years in the USA. Dr. Ajit Kumar was instrumental in guiding the development of innovative protocols for the …

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May 15, 2021 · GEORGEC. 1755 posts · Joined 2010. #7 · May 19, 2021. Years ago I owned an Acura MDX that had a vibration on slow speed left turns. The dealer said new rear differential at $3,000. My independent mechanic said there was a Tech Bulletin that said change the fluid. $64 later and a fluid change and the problem was solved. Some vibrations occur in a geometric progression. In the case of your vehicle, it may occur at 32.5 to 37.5, then again at 65 to 75, and would likely happen at 130 to 150. Slow speed vibrations are seldom harsh enough to be felt. The vibration may be amplified from the stress of torque applied during acceleration.The cheeseburgers from New York City's Shake Shack are so beloved by burger aficionados that even 12-hour Manhattan visits demand a wait in the Shack's imposing line. One burger lo...If its the 1st acceleration--- there is a self test that occurs at about 20 MPH. The self test is for the Stabilitrack.ABS system. You can hear it- and feel it in the brake pedal. 2023 Traverse LT 3.6L 15,000. 2013 Equinox 3.6L 121,000. 2003 Trailblazer 4.2L 188,000. 2010 Traverse 3.6L 193,000. Like. T.I have not observed any untoward vibration at idle, low speeds or any other scenario. Barely discernable to feel or hear when it does go in or out of V4 mode. 2019 Acadia SLT-1 FWD Smokey Quartz Metallic 3.6L V6. Cocoa & Ash Gray Leather Interior. Build Date: 4-11- 2019. . . Purchased 6-22- 2019 15,180 Mi 2-09-2024.This vehicle makes a subtle clunking noise when accelerating and decelerating. Follow along for the diagnosis and easy fix.Jul 28, 2020 · Vehicle Speed: A Misfire can be felt at any speed, but is most noticeable at low RPM. A misfiring engine is one of the most common reasons your Sierra will shake when accelerating. A vehicle’s ignition system consists of spark plugs, coil packs, and maybe plug wires. If it is an older model, it’ll have a distributor and coil instead of coil ... Experiencing a constant vibration at approximately 1600-1700 RPM in any gear at steady speed. Dealer service tech has been able to duplicate the problem on my 2017 Denali as well as other new Acadias in the dealer's inventory. The vibration seems to be engine related. However, there is no information on a probable corrective measure.GEORGEC. 1755 posts · Joined 2010. #7 · May 19, 2021. Years ago I owned an Acura MDX that had a vibration on slow speed left turns. The dealer said new rear differential at $3,000. My independent mechanic said there was a Tech Bulletin that said change the fluid. $64 later and a fluid change and the problem was solved. ….

The first electric Hummers will be making their way to their new owners this holiday season. According to Autoblog, GMC boss Duncan Aldred has announced that deliveries of the Humm...This 2010 GMC Acadia has a vibration and noise above 45 miles per hour. Let's fix that! Also bonus footage with a special guest. Merch: http://watchweswork.c...Fortunately, fixing a shuddering transmission is often as simple as getting a transmission flush to replace the contaminated transmission fluid with clean, fresh fluid. If the cause of your shuddering transmission is low fluid rather than contaminated transmission fluid, you may just need to fill up your transmission with more fluid until it ...5 posts · Joined 2020. #1 · Jan 17, 2021. Hello, I have a 2016 GMC Acadia which has a grinding sound on acceleration. This will make the noise whether moving or at a standstill when it hits 1k rpm. The sound is more prominent when it is cold outside. Also normally starts after about 2 miles of driving and lasts for a little while and then ...Having the same issue on my 2020 GMC Acadia. Dealer performed the bulletin that pertains to 2020 but didn't fix issue. Mine is a little different in that most of the times it occurs from 1200-2000 rpms. But can occur at highway speeds IF you are accelerating (gently IE: not jumping on it).Our trusty Acadia has around 140k miles. Recently, it started doing a slight shutter/shim when accelerating. It is in the front of the car on the passenger side. I've read that it could be the transmission, could be the front line drive bolts. We had the transmission fluid flushed/changed recently. It is still dark.2017 Acadia Limited AWD has progressively gotten more frequent engine shuttering at low end speeds of roughly 35-45 mph and as of today was in the 60-70 mph range. The issue started about 2-3 …My Camry 2008 also vibrates while accelerating at 50mph to 70mph, it shakes and vibrates while trying to gain speed, but after 70mph it barely shakes or should i say shaking is reduced. Went to the mechanic he said i should go check my newly replaced front tires, changed them again yesterday, though am yet to test run it on the highway. Any ...If the vibration is being transmitted into the steering, it's highly likely the suspect is at the front end of your vehicle. Having the tires rotated, like what RBarrios has suggested will help identify if the problem follows the (problem) wheel to the back of the vehicle, or if the problem 'stays' up at the front-end. Gmc acadia shakes when accelerating, We start to accelerate and the car moves, then there's a hesitation in the acceleration. Pressing the gas pedal further gets it out of this lull, as will waiting for a 1/2 second with the gas pedal in the same position. We purchased the Acadia on December 21, 2012, and it has exhibited this problem from day 1., 1 post · Joined 2023. #6 · Jan 30, 2023. Hello- My 2015 Acadia developed a shudder or skipping sensation from the rear wheels, primarily when turning left or right. GMC dealer diagnosed this as needing a rear differential clutch at a cost of 3200.00. 2800 for the part (??!!) and 400 for labor., When the Acadia is in 4 cylinder mode, the car shakes noticeably, especially when going back to accelerating - then immediately runs normal when it is pumping all 6. ... 2007 GMC Acadia SLT-2, 'HiYo' Silver outside, Ebony/Titanium inside, no …, I have not observed any untoward vibration at idle, low speeds or any other scenario. Barely discernable to feel or hear when it does go in or out of V4 mode. 2019 Acadia SLT-1 FWD Smokey Quartz Metallic 3.6L V6. Cocoa & Ash Gray Leather Interior. Build Date: 4-11- 2019. . . Purchased 6-22- 2019 15,180 Mi 2-09-2024., #engine #diagnoseissue #fixed #tips #advice #repair #partsfailed, My 2017 enclave has a shake/shimmy when accelerating from 45mph up to 60mph and it only does it while accelerating. I bought the car new and it has around 6,300 miles on it now. ... "I've seen the exact same symptoms while working on a 2010 Acadia about a year ago. The scan tool ruled out any ignition faults and lead the focus to the …, A shake and/or shudder during light throttle acceleration between 25 and 80 mph (40 and 128 km/h) steady state driving when transmission is not actively shifting gears. A shudder feeling that may be described as driving over rumble strips or rough pavement. Shudder feeling is evident in both Drive and M7 modes., Cooke Discussion starter. Yes it is an AWD and it has 119000 miles,the noise happened 1 time about 4 weeks ago and didn't do it again for about 3 weeks and now it does it daily when you turn and slight acceleration there's a clunk in the rear end you can feel through the floor board,I removed the tire and everything seems to be tight and in ..., My Acadia SLT has recently been making a rattling noise when turning left and during acceleration. When Parked if I accelerate the rattling noise also can be heard but diminishes when the engine goes back to normal idle. Noise comes from the front of the engine lower right, just underneath the canister vapor valve., Some of us may have a known issue going on with our vehicles that is a cause of concern and simply irritating. Chevrolet, GMC shudder or shaking when your driving down the road at a steady or slight acceleration. This usually happens around 25 to 80 miles per hour. What is it? Several things could be the cause like tire balance or wheel balance., A Particle Accelerator - A particle accelerator works very much like the picture tube found in a television set. Learn about the basics of a particle accelerator. Advertisement Did..., Nov 30, 2012 · If its the 1st acceleration--- there is a self test that occurs at about 20 MPH. The self test is for the Stabilitrack.ABS system. You can hear it- and feel it in the brake pedal. 2023 Traverse LT 3.6L 15,000. 2013 Equinox 3.6L 121,000. 2003 Trailblazer 4.2L 188,000. 2010 Traverse 3.6L 193,000. Like. T. , Usually. 1. Underinflated Tires. Pulls in the direction of the low tire, no noise (maybe a slight tire hum) Check the tire pressure on all four wheels if your GMC Acadia has a shaking steering wheel. Low tire pressure is the number one reason a steering wheel will shake (and the easiest to check). An underinflated tire will cause your Acadia ..., The turbo pressure sensor: This sensor will manage the pressure exerted in the turbo of your car, if it fails it may disrupt the performance of your turbo and deliver vibrations that you may experience within the acceleration of your GMC Acadia. If the turbo is punctured or ruined, the effect will be alike, the power supply of your turbo will ..., We start to accelerate and the car moves, then there's a hesitation in the acceleration. Pressing the gas pedal further gets it out of this lull, as will waiting for a 1/2 second with the gas pedal in the same position. We purchased the Acadia on December 21, 2012, and it has exhibited this problem from day 1., 2014 GMC Acadia - Front end shakes under acceleration. Ok, time to vent... NEW 114 miles: We bought a new 2014 Acadia, SLT2 FWD in November of 2014. This thing is loaded; double moon roof, tow pkg, rear DVD heated/cooled/memory seats the whole 9. The ideas was to get my wife into a nice, new car as we hoped it would last for years to come as we ..., May 15, 2021 · GEORGEC. 1755 posts · Joined 2010. #7 · May 19, 2021. Years ago I owned an Acura MDX that had a vibration on slow speed left turns. The dealer said new rear differential at $3,000. My independent mechanic said there was a Tech Bulletin that said change the fluid. $64 later and a fluid change and the problem was solved. , First time visitor.....I purchased a 2015 Acadia SLT back in Jan. In the last few weeks, I've noticed the same "knocking" sound coming from the front end. I only hear the noise at low speeds (less than 10mph), when driving over small bumps. I have noticed some vibration in the steering wheel between 55-65mph. It currently has about 46K miles on it., gig229. 208 posts · Joined 2007. #4 · May 23, 2013. The hissing noise is a refrigerant leak in the AC system. Your dealer will need to run a leak test on all the connections, hoses, and both evaporators to determine where the leak is. But I will tell you that on my 09 Enclave, both the front and rear evaporators had to be replaced as they ..., 12 posts · Joined 2012. #1 · Feb 21, 2016. I just noticed that the other day my 2008 Acadia with 130,000 miles has a slight hesitation or stutter during mild acceleration which typically occurs around 1800 RPM. The transmission was replaced when it was under warrantee, and we just got the transmission fluid service from the dealer 2 weeks ago., First time visitor.....I purchased a 2015 Acadia SLT back in Jan. In the last few weeks, I've noticed the same "knocking" sound coming from the front end. I only hear the noise at low speeds (less than 10mph), when driving over small bumps. I have noticed some vibration in the steering wheel between 55-65mph. It currently has about 46K miles on it., I know this is an old topic but I couldn’t find a clear answer. I have a 2014 GMC Acadia Denali, when I’m at highway speed around 65 mph I start to notice a shake/vibration throughout the car, until around 75mph then it’s smooth again, when I accelerate it gets worse but as soon as I let off it lessens, it also doesn’t seem to do it …, 2-Check the Transmission Fluid. Low or dirty transmission fluid can cause problems, including a whining noise when accelerating. Pop open the hood, locate the transmission dipstick, and check the level and condition of the fluid. If it’s low, top it up with the recommended fluid type for your vehicle., We purchased a 2014 Acadia Denali AWD on 8/28/13. This vehicle has had a vibration since then that to date has not been fixed. We returned it to dealer and first attempt was Road Force Balance. Vibration still there. Vibration goes away when drive shaft is removed. GM was contacted and rep told dealer to replace differential clutch …, New 2020 Acadia owner with V6. This is my wifes vehicle and just noticed a vibration/hum at low RPM. In park or in drive. 1200 miles. Have not taken it to the dealer yet. This is the 2nd issue so far with this vehicle, the auto start/stop has quit working also. Took it to the dealer for that, they reset it and it failed again a week later., We start to accelerate and the car moves, then there's a hesitation in the acceleration. Pressing the gas pedal further gets it out of this lull, as will waiting for a 1/2 second with the gas pedal in the same position. We purchased the Acadia on December 21, 2012, and it has exhibited this problem from day 1., 2 posts · Joined 2014. #1 · Oct 18, 2014. 2009 Acadia has 128k miles and shudders under light acceleration 20-25 mph, 40-45 mph and 60-65 mph. I took this to a GM dealer who diagnosed the rear upper lateral links as being " blown out". I've since replaced them both to no avail as the vehicle feels like your going over a rumble strip when this ..., The Accelerated Cost Recovery System (ACRS) is a depreciation method that assigns assets periods of cost recovery based on specific IRS criteria. The Accelerated Cost Recovery Syst..., airforceone Discussion starter. 95 posts · Joined 2013. #1 · Dec 14, 2013. I am feeling a transmission shudder if driving at 20 or 43 MPH with my 2007 Acadia. Once you pass through those speeds the shudder stops. Those speeds coincide with the new GM transmission calibration: From 2 to 3rd gear at 20 MPH and from 4 to 5th gear at 43 MPH., 11 posts · Joined 2007. #1 · Oct 23, 2007. Hi. I have a vibration problem with my Acadia SLE AWD. There is a noticable vibration through the accelerator pedal between 1600 and 2000rpm, and sometimes when pushed (i.e. overtaking, going up hill) this vibration (and noise) increases and shakes the entire dashboard for a short period of time., 23754 posts · Joined 2007. #12 · Jun 24, 2011. Several other things can make your car shake while braking! These are: 'hot' (or hard) spots on the rotor (or drum), rust on the braking surface of the rotor (or drum), an over-active ABS system, tire (or wheel) problems, and. roadway problems., 1. Erratic shifting. One of the first symptoms of a bad or failing downshift solenoid is erratic shifting. If the downshift solenoid has any issues, it may cause the vehicle to behave erratically when downshifting. A bad or failing solenoid may cause the vehicle to experience hard or erratic shifting when slowing down or coming to a stop., Jul 28, 2020 · Vehicle Speed: A Misfire can be felt at any speed, but is most noticeable at low RPM. A misfiring engine is one of the most common reasons your Sierra will shake when accelerating. A vehicle’s ignition system consists of spark plugs, coil packs, and maybe plug wires. If it is an older model, it’ll have a distributor and coil instead of coil ...