here is the deal, I took my boat out on Dec 3. It ran great, I wasn't going to run again for a while so I filled it up full with gas and added Sta Bill fuel stabilizer to it. I measures everything out correctly. I took my boat out yesterday Jan 22 it cranked up great so I started going. Wide open I let off and all of a sudden the engine started cutting out and would not go? I came to a complete stop trimmed down gave it gas it would not go it was trying but wouldn't. I would keep putting the throttle in different positions and finally it was start to go. But it would be jumpy getting started still cuttting out but finally it would go, so once I got it going I ran it wide open for about 20 minutes straight. Did great but when I let off it started cutting out again and would come to a stop and sometimes shut off. Whats the problem, it felt like the plugs werent firing I don't know somebody help??