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Good morning All, i have been having some issues with my 2013 Cadillac ATS 2.5L. When the car is cold and sometimes even when its already warmed up when i place the car in reverse or drive it vibrates like it wants to stall, Sometimes this happens when i come to a full stop as well but goes away if car is place is Neutral. When on a cold start the RPM jumps from 1100-500, then it stabilizes after a few minutes. I have already replaced the plugs, cleaned throttle body and even pour fule cleaners but the issues will not go away, Motor mounts are good as well. What else could be causing this issue? Should i be concern?