buddy has a 99 firebird and the check engine light keeps coming on he had it checked and no codes come up. the engine light will come on when he floors it it sputters and misses and you have to let off it to get it moving. the car is also hard to start he has to turn the steering wheel a little to get it started. you guys have any idea? weve been told it was the maf, the tps, or even a coil pack. were lost