Okay, I have a Johnson 35 hp motor that would not run woithout the choke out. I cleaned the carb and it ran better and then lost power again. I then put a carb kit in the motor but it still does the same thing. After about 5 mins of operation it acts like it drops a cylinder or like you throttle back. Could it be a power pack or coil. It seems to do it after the motor is warmed up.