I have a 2002 seadoo gtx rfi that was rebuilt. when i started it the first few times everything seemed to be going very well and all of a sudden it stopped cranking, i checked for spark and sometimes it would spark but sometimes not. then the spark appeared and tried to start but could not. I checked the injectors and when I gave it to start they injected very little fuel and then almost did not pour, I measured the injector harness and there were 5 or 6 voltages in them. Please I would really appreciate if someone could help me.