You guessed right about the 4 cylinder auto trannie, so you're probably right about everything else. You are also riht about it not happening in Neutral..(I only know that cause i got to experience my first icy spin out in the new car and a close up veiw of the CN trainyard fence rail.)

Thanks much. That does put my mind at ease on that then. i was running some fuel injector cleaner through to see if that would help, and it didn't seem to be, but i also noticed it isn't static in the amount of vibration that happens. sometimes it's worse then other times, which seemed strange if it was the timing off.

Thanks for your information.