[Whoru465]

By shimmy I mean a forward and reverese shudder rather than a left right shudder...It rocks you back anf forth in the seat...Make sense? It definately feels like something is off balance in the engine....Could a misfire cause that kind of vibration? I think its odd that it just happened suddenly after it had been parked for a few hours...Hmm. Although your theory about the mount seems like a good start. Is it a pain to replace? Thanks again