I have a intermittent problem and I need help. OK, here is what is going on. My quad will sometimes not wrap all of the way out, when it is having this issue, it backfires, spits, & stutters. Now sometimes when this problem is occuring I can turn the key on and off and the quad will then run better. I've taken my quad to the dyno 2 times to make sure the air/fuel mixture is correct. You can see my mods - no motor work. I've read about people have ECU isssues and throttle position sensor issues. I need this thing to run great all of the time, not just hit or miss. What I've done: I've changed the spark plug about 5 times, I took the power commander off and re-istalled it, I took it to the dealer - (they just road it around in the parking lot and said it was fine) - The main issue is top end & every once in a while starting. Please help.