I know there are other posts about this. trust me I did as much research as possible before submitting my concerns here. but I have no other options. ive been to 2 different dealerships, ive even gone through GM. and no one can figure out what is wrong with my car. it shakes at idle. not a subtle vibration but if will physically move you while your sitting in the drivers seat. the first dealership did a full intake cleaning. replaced the faulty intake manifold. replaced the water pump. cleaned the throttle body multiple times. ive changed the plugs gapping them at .028 and have checked twice sense. the second dealership change out the valve cover for a second time along with the tube that connects the intake with the turbo. it will shake whether the A/C is on or off. but only at idle. its a manual transmission that has been replaced twice already. there is no CEL. GM tells me that the car I functioning as it was designed. I didn't know GM designed cars to shake it currently has 96K miles on it and the shaking didn't start until 6 months ago. please someone tell me in not crazy.