While running at full throttle my motor will fall on its face but does not die and if I try to keep going it will cut out very bad, if I idle down and then pick back up the throttle it is fine. this is a random problem that is driving me nuts. I have added a new ball,hose and fittings. I have run a tank off Seafoam through it, installed new plugs, cleaned the fuel filter and flushed the carb. jets out. this motor runs great except during this problem. Any ideas would be greatly appieciated.