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Discussion Starter · #1 · (Edited)
I have a 2011 GLS with 107,000 miles that is jerking hard around 5,500 - 6,000 RPMS. It doesn’t do it at any time at lower RPMS. It’s an automatic transmission. It almost feels like it’s jumping from a lower to higher gear and back really fast. It continues until I start decelerating.

It only happens when I really get in it. There are no computer codes when tested with a diagnostic tool.
Any ideas as to what the problem may be?

Thanks in advance!

Marc
 

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Automatic transmission.
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Discussion Starter · #2 ·
UPDATE

Induced the problem again briefly. The tachometer jumped pretty wildly during the jerking. Also the ‘check engine’ light came on briefly and then went off and stayed off.
 
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