# Engine Shaking and RPM Fluctuating While at Idle and Accelerating **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** nissan, altima\ **Created:** [September 24, 2020, 12:17am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325 "2020-09-24T00:17:10Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![johnmorganiv835\_170989](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@johnmorganiv835\_170989](https://community.cartalk.com/u/johnmorganiv835_170989)\ **Post date:** [September 24, 2020, 12:17am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/1 "2020-09-24T00:17:10Z")
Video of engine, hood (to show engine shaking), and dashboard - [https://drive.google.com/file/d/1q9ZvvtOWUJqOflbIknqClnov0USEI4T9/view?usp=sharing](https://drive.google.com/file/d/1q9ZvvtOWUJqOflbIknqClnov0USEI4T9/view?usp=sharing) Hi all, please help me diagnose the issue with my 2011 Nissan Altima Coupe. Mileage - 148318. Was driving home and started accelerating from braking (red light changed to green) and then the engine started shaking the rest of the drive home with the RPM fluctuating +/- 1 of where it should be based on speed. Shaking lessened when slowly accelerating but constant at even speed and idle. Maintenance History: At 144738 miles - Throttle body fixed (had crack), PVC hose replaced with correct hose - Recommended but didn’t perform: Complete fuel service, Replace power steering fluid, Replace spark plugs At 142359 miles - Replaced battery - Program ECM - Replaced mass airflow sensor At 138880 miles - Replaced transmission At 134949 miles - Replaced mass airflow sensor - Replaced angle sensor - Replaced PVC valve and PVC hose ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [September 24, 2020, 12:56am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/2 "2020-09-24T00:56:24Z")
Check the motor mounts to make sure they are tight on both sides of the mount and aren’t broken. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [September 24, 2020, 1:31pm UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/3 "2020-09-24T13:31:49Z")
From your post it seems like you do not do your own work… You didn’t say if your check engine light was on… Why not take it into your favorite auto service place and describe the problem to them? ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [September 24, 2020, 1:40pm UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/4 "2020-09-24T13:40:06Z")
> [@Mustangman](#): > > You didn’t say if your check engine light was on… +1 I suspect that it is lit up, but perhaps the OP can return to clarify the matter. ---
**Author:** ![johnmorganiv835\_170989](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@johnmorganiv835\_170989](https://community.cartalk.com/u/johnmorganiv835_170989)\ **Post date:** [September 25, 2020, 12:01am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/5 "2020-09-25T00:01:10Z")
No thus far I have not done my own work but with the amount of money maintenance has cost so far, I’m looking to solve this issue myself if possible. The check engine light is not on. If you watch the video linked to about 50 seconds in it shows the dashboard with the RPM fluctuating and no check engine light ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 25, 2020, 12:05am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/6 "2020-09-25T00:05:14Z")
> [@johnmorganiv835\_170989](#): > > Replaced angle sensor Crank or cam angle sensor? Tester ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [September 25, 2020, 12:29am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/7 "2020-09-25T00:29:30Z")
Many possibilities needs a good diagnostic workup. But my guess is a problem with unmetered air getting into engine. Check intake air path, vacuum system, and pcv system to begin ---
**Author:** ![johnmorganiv835\_170989](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@johnmorganiv835\_170989](https://community.cartalk.com/u/johnmorganiv835_170989)\ **Post date:** [September 25, 2020, 1:32am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/8 "2020-09-25T01:32:41Z")
What specific diagnostics should I run? I have an OBD II reader so can do a variety of them from an app on my phone ---
**Author:** ![johnmorganiv835\_170989](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@johnmorganiv835\_170989](https://community.cartalk.com/u/johnmorganiv835_170989)\ **Post date:** [September 25, 2020, 1:39am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/9 "2020-09-25T01:39:55Z")
The invoice doesn’t specify, it says “Product Code” is “047-200”. After looking it up online it just specifies “Tune up, Parts” for that code ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [October 17, 2020, 1:24am UTC](https://community.cartalk.com/t/engine-shaking-and-rpm-fluctuating-while-at-idle-and-accelerating/170325/10 "2020-10-17T01:24:34Z")
> [@johnmorganiv835\_170989](#): > > What specific diagnostics should I run? I have an OBD II reader so can do a variety Misfire and fuel trim.