Vibration right off idle

plumkrazee70 said
The engine, while relatively new has been run with the 904 behind it for a very short time. This can't be. Misfire. I can feel it in my seat.

OK if you can feel it in your seat, that is telling you that the transmission is making contact with the tunnel and transfering the vibration through the floor up to your seat.

Yes, scratch the misfire then.