I also have a A&M 3.2. The thing I have noticed with mine was the crank had a ton of play in it. This caused excessive vibration in the model, especially at idle. The engine itself ran great, started easily etc. I found that the front crank snout does not protrude all the way thru the bearing inner race. Somehow the crank had started to spin in the bearing itself. So what happened was the crank was worn smaller that the I.D of the front bearing. I had to turn the crank shoulder down, and install a sleeve and then press the new front bearing on. It is nice and slop free now. Does your crankshaft have alot of side to side play in it?