Vibration on 1100 RPM on audi A6 2.8 V6 FSI
 

Hi all,

I just bought 2012 audi A6 2.8 FSI FWD,
there is a quite strong vibration on 1000-1100 RPM. it feels the vibration coming from the chassis.
btw i can produce the vibration although i'm in netral(the car is stop)
engine mount was replaced end of 2016 which i believed it's not because of the engine mount.
I just changed also Transmission mount and it's not working too.

anymore idea what would be the cause of the vibration?

Thanks