I have a 2005 a6 3.2 fsi with a vibration/ 200 rpm bounce. It happens in park when I step on the gas and try and hold the rpm at 1400 rpm. It doesn't stay steady but bounces up and down either way in a 200 rpm range. Idle is smooth at 800 , vibration kicks in at 1200 and goes away at 1600 rpm.

Also when the engine is cold In the morning , there is a small hesitation when accelerating through the same rpm range. Goes away when engine is warm. But rpm bounce and vibration in park remains at all times. Not sure if the two symptoms are related.

I've replaced plugs, fuel filter, coils, air filter, cleaned the throttle body. Throttle adaptation. No codes . Please help with any suggestions.