just got the car running a few weeks ago 6.0l ms4 cam t56, it has aftermarket injectors and my tuner just through a base tune in it so that the car would run, now when i start the car cold it runs fine for about 30 sec or so drives good at low rpm goes through the gears then after that all hell brakes loose. i loose throttle response it loads up with gas and it starts backfiring, could this be a bad sensor or do u think its just in the tune? i'm gonna have it dyno tuned on thursday, btw once the revs get above say 2500 it runs like it should