Kevin, beat ya!
Lou
It's a 4tec. Not a 2sttoke
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[MENTION=43374]Coastiejoe[/MENTION] , first post he's listed it an 06 GTX as the ski with the problem.It is within your profile Watercrafts 1999 Seadoo GSX RFI
RFI stands for "Rotax Fuel Injection"
And it could be in limp mode, but normally there is some sort of a code. Do you have any lights or messages on your display?