I dont know why but my car has had this problem for a while now and cant figure it out. under light acceleration the car (sometimes, idk why not all the time) will hesitate/stumble for a few sec's then backfire (usally just one small pop). but as soon as the car backfires it will takeoff like it was building pressure then the backfire was its releif. i thought it was my intake leak or bad plugs but nope. the car was dyno tuned and it cont. to do this on the way home..therefore tuning didnt solve the issue. could this be related to a bad tps? i have no problems at full throttle it only backfires/ hesistates under light accel. thanks for ur help!