2004 GTX 4 Tec supercharged. Was the water started acting like it was running on one cylinder after loading on trailer fires up and revs just fine. only work done lately is supercharger just rebuilt and installed and also replace starter solenoid. It cranks over very slowly I had the battery load tested they said it was fine but I have my suspicions. If I let it sit for about 10 minutes on the water it would run fine for about 1 minute and start acting up again. can somebody tell me where to start looking this seems to indicate a lot of different things don't know where to start.