[Bob Johnson]

This might not be what is happening with your car. I had a similar problem. The cause was the engine mounts. When I installed the engine I tightened the rear engine mounts with the front of the engine not seated down all the way. Thus the front of the engine was not "floating" on the front engine mount. I loosened the rear engine mounts and the front of the engine dropped down. I re-tightened the rear mounts and the vibration calmed down.



If you push down on the front of the engine the front mount springs should compress a little.



Bob