I have a '86 Johnson 6hp on a 12' jonboat. It starts on first pull and runs great up to 1/3 or higher throttle, then engine acts like it is missing. So far I have replaced the coils, power-pack, plugs, plug wires, and fuel pump. I have a carb rebuild kit but do not want to tear into that just yet unless that is most likely the problem. I have a service manual but it does not give an exploded diagram for the carb. Anyone have one that has been scanned and can send to me?