I have a 22' cuddy with the AQ140A 4 cyl. engine. It has the 280 outdrive. The problem i'm having is the boat runs great in the driveway and will run forever. But when i take it to the lake it's a dog, accelerates extremely slow and will only max out at 3500 rpm. Not only that but it will run for about 10 minutes and cut out. I have cleaned the gas tank, rebuilt the carbs, checked timing, crank to cam timing, checked all fuel lines, exhaust has good pressure at outdrive, checked compression 155-160psi per cylinder. Question: does this engine have a exhaust flap in the manifold that could be plugged? Maybe wear on the valve pushers or cam? Any help would be appreciated.
