Gasping for air 2! The Return

[1fastben]

In the last installment of 'Gasping for air!', I had said that my car would hardly start, and when it did, barely even stay idling. Also, when it idled it was lower than usual, and if I gave it any gas it would die immediatly. So I disconnected the MAF sensor and the idle evened out and I was able to give it gas just fine; but I can't drive it that way, cause then I couldn't run any boost because it would be lean on fuel. Then I plugged the MAF sensor back in and it died quickly. I replaced the MAF sensor w/ a used one, (new probably don't exist any more?) and it does the same thing. Does this sound like another faulty MAF sensor or could it be something else entirely?

[Knight Rider S4]

Have you run VAG.com to see if any relays are at fault

[Dan_s2_coupe]

I would get the fault codes checked maybe there is a fault in the ecu and when the data comes from the MAF that it cant work then out just hope dont have a sum error fault