Sorry to everyone on this thread. I had to wait and wait to hear different stories from two different mechanics. What it turned out to be was a bad engine mount. Crossfires have three, I was told two. They HAVE THREE. I had on bad mount replaced and everything is fine now. Please please please check the mounts. I had about 73,000 miles on mine before the mount broke, and also about 63K when the clutch was replaced. Keep us all up to date with what happens in your case. THANKS!