I have been having an issue with my boat since the end of last season and I was hoping someone would have some input on possible cause. The boat runs fine for 30-45 min then it will start to shutter and loose speed if I ease the throttle back to idle it returns to running fine and I let it idle down the river for a few minutes then take off again it runs fine for 5 minutes and shortly thereafter it does it again. My mechanic & I recreated the issue in the fall of last year with a fuel pressure gauge hooked up and even during the shuttering the fuel psi stayed a steady 60 psi so that leads me to believe it's not a fuel delivery issue. So next we changed the spark plugs, wires, rotor, dist.cap & coil to eliminate those as issue but I have taken the boat out twice this year & it has the same issue. Any input would be greatly appreciated, I have taken it to my closest Moomba dealership H2O watersports in Dothan AL but it will be a couple of weeks before they can get to it.