just bought a brand new pro m maf for my car calibrated for 19s my coupe is stock motored. ran fine the last 2 days.. then tonight on the way home from walmart the check engine light comes on and the idle was surging with the a/c on im fucking pissed seems like everything liitle thing i do theres a problem i swear if i put a a new shift knob on it would fall off racing and redine my car and explode my motor fuck.