Shaking at Idle

[Kev3.0]

I was sitting in my car (A4 3.0 6spd) and noticed that while the engine is cold the car shakes noticeably the rpms seem constant. When I rev the engine the shaking stops. The shaking is very noticeable, it seems like it is coming from under the drivers seat. I have had both bank 1 and bank 2 catalytic convertors(66K miles) replaced and the coolant temp sensor replaced(70k) already. The car has 80k on it right now. Any help would be appreciated.

[AudiA4Turbo22]

it's normal, but if u feel it isn't check ur tranny and motor mounts!