Engine mount bad
I found 2 photos in the FSM for the placement of the biscuits. One placed the biscuits in a position that looked right but did not fit. The other fit fine but most of the biscuit was not in contact with the mounting surface
It was a struggle to get the wrong way biscuits installed.
Maybe one side is upside down OR you have a non 340/360 metal mount?
OR it's just broken and slipped!