When I first take out running the boat starts good and runs across the lake at 5500 rpms. No problem at all. When I leave fishing spot an hour later and run it wide open it starts to jerk like it's cutting out, but when I cut back to 2500 rpm it doesn't do it that often. I have had the carbs rebuilt, the ignition coils changed, spark plugs changed, drained and clean the tank, replaced all gas lines. I'm clueless. I'm going to change spark plug wires as last resort. Help! Running out of money.