I am having problems with my sportjet 175. I recently had the gasket from the motor to the pump and the one around the exhaust replaced because of leakage. I was out the other day and the motor started to act up. (I have 80 hrs on it since new gaskets.) It would idle and only go full throttle, nothing inbetween. This is what seemed to happen when gaskets leaked but I could see a ton of water leak into my bildge last time and none this time. What else should I look into to figure out my problem? Anything in mid range would start the motor coughing and then stall. Has new BUZ8H plugs in it now also. Thanks for any help.