New to PWC's here so go easy on me if I seem ignorant. Bought my first PWC this year in May...used Sea-Doo GTX 2001 w/951 non DI. I had a full service done at an authorized dealer...stated the doo to be in good condition. It ran like a beast all summer until 2 days ago. Hard starts and stalls out like crazy for the first half hour then runs great again. Sounds like plugs or fuel restriction problem to me. Plugs have about 20hrs on them and don't look bad but I'm replacing in morning anyway. I then pulled the fuel filter bowl to have a look...YIKES. The bottom of bowl has a small amount of this grey waxy feeling garbage. My first thought was these grey fuel lines breaking down that I've heard about. This garbage was below the filter itself in the bottom of the bowl. So should I replace the lines? I just find it so difficult to believe that Sea-doo would used faulty fuel lines. Any thought on what else this stalling might be?