[V8] Exhaust re-installed, but now we have vibration at idle

[gbmarc at cox.net]

Thanks, those are some good suggestions.
I experimented a little more on the way to work this morning, and discovered that if I put the gear in Park while idling, then the vibration goes away (or should I say, goes back to what was normal. ) Holding it in drive with my foot on the brake, brings it back.
So it's definitely something to do with having the transmission engaged.

Mark.