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To test this would be drive the car about 30 min. (let transmission warm up) then set the cruise control between 55-70 mph.
If the car feels like it is running over the freeway rumble strips (pulsing forward and hesitating) then the issue is present.
If you mash the gas, so to speak, the car performs flawless...but for a daily driver the problem is very annoying trying to simply run the speed limit.
Only temp. fix was triple flush and new converter, but GM has paused that warranty repair for now.
I personally did my own flush and filter replacement with AMSOIL and haven't had any more issues.
Several, several, several threads about this issue already exist and it would be easy to find more information if needed.
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