I need help, I have a 1994 195 sundowner with a 5.0 litre V8, carburated. I have been losing RPM's on the engine. it should run 4000 to 4400 per engine specs. I may get 3600 out of it. The boat brand new came with a 19 pitch prop, ran fine. I had mechanic look at it. He put a 17 pitch prop...