Hold on real quick, before we start throwing "could be this" "could be that" at it, we need a few things from you:
1) Complete mod list, to include ANY modifications to the engine/fuel system, etc etc etc.
2)EXACT depiction of symptoms, not a "feels like this" or "I think it could be this". We need to know exactly what the car is doing, under what circumstances it's doing it, and what you've already tried (and HOW you've tried said things) in attempt to remedy the issue.
3)You need to jump on VFAQ and read your face off. Seriously. Even if you are only using your phone. If you're browsing and posting here, it's definitely fast enough for VFAQ.
Once you get that stuff taken care of, it'll be a LOT easier to help you figure out what's wrong with the car, and provide ideas and suggestions on how to go about fixing it. There's a LOT of info missing, or sketch in your above posts, and in general it sort of makes my head hurt.
-Jake