i just bought a 70mm maf sensor and mac short ram intake from mcnews i'm running sock injectors and stock computer the maf was calibrated to my computer code i've had it on my car for about a week and last night i was driving around and i started to notice the car was stumbling everytime i press on the gas it's like nothing far a second and then it goes even with the revs up high like 4.5 grand and when the motor idles the revs jump up and down like it's not getting enuff fuel has anyone else had this problem and what can i do to fix it any help is greatly apperciated