Looking for more theories on the symptoms in my 2QM20 (79' C&C 34). I occasionally have a dip in rpm's or throttle when under way. It never gets worse once the symptoms have occurred and I have noticed the last couple of years. This year, I've changed out the fuel lift pump and have fresh, clean fuel and filters. I have no fuel leaks. The head and one cylinder was rebuilt in 2006. I have minimal white/grey smoke, which get more intense under high rpms/load. I use FPPF in my fuel. run a 3-blade feathering kiwi prop.
So, might I have a small pin hole air leak somewhere (where?) that "goes away" once engine heats up? I haven't checked the fuel pick up line yet in the tank--is it possible to create a small air leak if the tank is less than 1/2 full? could a cranky blade on my prop alter rpms like this? It feels like a short fuel shortage, but the problem never gets worse.. driving me crazy trying to diagnose.
thanks for the ideas.