I have been watching the site for years but have not needed to post because there have been so many good answers out here. Now I am truly stumped. I have twin 225 Yamaha 4 strokes 2002. They start and idle fine, I pull out of the marina get on plane and one engine will bounce around like it is cavitating, and it will not go above 4300 rpm. If I stop lift the trim all the way up, and put the engine back down, it will work fine all day, even if I stop and turn them off. Fuel is fine all filters clear. This happens every time I go out. Any help out there to point me in the right direction would be appreciated.