Have a 1972 65hp Johnson. When shifting foward engine starts to bog down around 3500rpm. I have rebuilt all 3 carbs top to bottom left to right. Engine revs fine while in neutral from idle to 5500rpm without skipping a beat. I have good spark on all three plugs and compression ranging from 135-145psi on all cylinders. I have also flushed the lower unit with multi-vehicle synthetic ATF as recommended as well as running a Type "c" lube in normal operation. Could this be a remote conrtrol switch problem or a lower unit solenoid problem? Any advise would be helpful, Thanx.