[brbjim]

It could be that your engine mounts are shot or your tourqe converter may not be engaging all the way. you can test the tourqe converter by brake tourqing the vehicle and seeing if it shakes and while you do that watch the engine- none of the hoses and wires should be geting tight. if they do your engine mounts are shot. it could also be that your timing is off so check the timing with a timing light.