Problem!!??

[Talon628]

So I took my GSX 97, out for the first day so that I could try to street tune a little,I have alot done to it, I started going it ran fine all the way across town. then I sat, let it idle for a bit, then it began to run rough and the check engine light came on and it died. Couldnt get it to start again, it would just rumble and die again. Im thinking it could be a sensor,maybe the o2 or somthin. not sure wondering what you guys might think?????