I drive a 2001 A^ 2.7t(currently running stock prog since this issue).I've been having on and off misfire issues for about a month. I checked all the usual stuff, plugs, coils, ICM's etc..I had a new motor put in about 6 months ago that had a diff model MAF, so we had to go with it. I kept getting an epc light, and a MAf related code every now and again,but the car ran fine up until about a month ago. Cleaned the maf with no luck. I bought a used one that was the identical model, from a car that had no codes and a working MAF. I put the used MAF in, and I got the ESP and ABS lights, just like running with no MAF at all. I returned it and just got a brand new one. I also changed the connector housing and re-pined it because it was worn. I just installed the new MAF after disconnecting the battery for about 1 min, hoping this would reset and clear any codes. I left the ignition on for about 4 min or so because from what I read, this will reset the throttle position. The car starts up now(before with the old maf, it wouldnt even run with it plugged in) but I still get the ESP and ABS lights as if its running without a MAF. It the rpm's needle also jumps everytime I let off the gas after revving the engine, also like running it with no MAF.

 

Please someone give me some input before I take a sledge hammer to this car!