concerning the Rack Damper bolt - this seems very straight forward and easy to do. What exactly is this doing - is this for my engine boucing around like a bowl of jello?

it originally was shaking worse - loud, sharp and rough. I replaced the engine mounts (needed them big time) I have the transmission mount but have not installed it as of yet. I am assuming (I know about assuming ) that is the issue - I am interested in the Rack Damper bolt though - could it be both?