I need help. Im new to the jet boat world and have a 1996 speedster. I run it a dozen times this year and have had no problems. But the last two or 3 times I am having issues with one of the engines. When I hit the throttle on the one engine it it slowly revs to about 4k it then pauses for a second and revs to 7k. Every time I take it out it seems to be getting worse. I was pulling my buddy out of the water on some skis and the engine wouldnt go over 4k at all. When the boat is out of the water and hooked to the hose, it seems to rev fine. When under a load it has trouble. when the engine finally does rev it seems to run fine. I pulled the plugs and it look to be running rich, but after i put the new ones in , there was no difference. It merely just doesnt rev as fast as it should. ANY IDEAS