2015 chevy sonic with 35,000 miles automatic transmission three months out of warranty .The car vibrates in gear and in neutral. Vibrations are more noticeable at 1000-1300 rpms, the dealership feels the vibration but cant isolate where is coming from. The sonic is having a sleep over with the dealership tonight. During the day they plugged a scanner to it no codes no missfire fuel trim is good no vaccum leaks. Rubber intake boot not torn pvc system normal engine and transmission mounts checked and loosen and retighten coil pack is good spark plugs are good and gapped . Tomorrow the engine techs are going to take a crack at and they're calling gm tech support. Any help will be greatly apreciated. I bought a car not a vibrator.