98 GTX RFI 787 Engine wont go over 2000 rpms

I just bought this seadoo and it ran fine the first day I had it out for about 2 hours then the performance started fading. The next time I took it out it wouldnt go over 2000 rpm and dies immediately if I'm not hitting the throttle. I dont know where to start but I want to get this thing up and running fast before summer is over. Oh and one more thing after the 2nd time I took it out I charged the battery and swapped the spark plugs because I was also getting a low volt code. After that It ran well again for about 20 mins then did the same thing wouldnt go over 2k rpms.
 
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