When the vehicle is at a stop in Park or in Drive, if I turn the steering wheel left or right the wheel vibrates badly. If I bring the RPM above 1,200 the vibration stops. If I turn the A/C on it gets worse. I brought it back to the dealer that I bought it from. The service writer that checked the car in felt the vibration and verified something is wrong. The Service Manager and a tech checked it. When I picked it up it was the same and like usual no one was available to talk to me. The service order I recieved stated "Roadtested by Tech/Service Manager, no problems found. Operating as designed. I did not know Chevrolet designed vibrations into thier vehicles.