Not sure if you mean the whole car shakes or the engine. If it's the engine, and also has a loss of power associated with it, it could be the ignition module that sits on top of the spark plugs. Also could have the check engine light on and you may hear the cooling fans running also when the car is not warm. I could use a little more info if you can.
Friday, February 12th, 2010 AT 6:11 PM