If maintenance is up to date and there is no other driveability issue, I would have to say it is normal. In gear there is more load put on the engine which can be felt in a manner as you describe. My cars have done it and there is no issue with them. Engine vibrations are hard to completely isolate from the rest of the vehicle. If you feel it is an issue take it to the dealer and have a tech go for a ride with you so, if there is an issue, it can be noticed before it gets worse.
Engine shudder in 08 LTZ w/ 3.6
I have an 08 LTZ 3.6 that's having a mild shudder while idling. The best way I know to describe it is it's as if the engine is out of balance, if that can even happen. It's not a vibration, but "soft" shudder. It is worse when idling in "D"rive, such as at a stop light, than in "P"ark, but isn't at all noticeable during acceleration or cruising. There is no drop in RPMs or error messages in the DIC. I have looked through some of the threads here, but none of them seem to encompass my issue. I just bought this car a month ago and have it under the GMPP Major Guard Warranty, but I would like to be armed with a little knowledge of this issue in case the dealer tries to tell me they can't replicate it or claim it's normal. Thanks for the help guys!!!
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