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I have a 99 A4 coupe (Z51 susp) with the following mods: Blackwing w/ice box, LS6 manifold, carbon airbridge, B&B Bullets, 3.42 gears and a street tune with no codes. Here is the issue – from a dead stop when go to WOT, there seems to be a lag in acceleration before I am pushed back in my seat and I can’t spin my tires (BFG Eagles F1). Also, when in idle and blip my throttle, I notice my RPMs don’t rise or fall immediately. My tuner has looked at everything and there are no problems with my MAF or any other readings. HELP!!!!
I know it seems simple, but check the spark plugs and plug wires.
Replaced plugs with NGK TR55 and MSD wires. Seems to idle just a bit better, but no chirp Cleaned the MAF and TB too Throttle body was gunked up. My car has 44k miles and I don't know if it was every done. If you haven't done yours, I would recommend it.