Thanks Jim for your insight. The $1700 quote from the dealer is just for the 2 codes that they found (engine timing, misfire). Do you think changing the mounts will fix the "vehicle shaking?" Your input will help me in what to do next. Do you know where I can get an official repair manual for my car? I have no experience in doing any car work. Can you suggest a good, trusted shop where I can bring my car to here in Southern California? I really appreciate your help.