Red oil sensor light, maf code with misfire popping
 

Hey guys, thanks in advance.

i just picked up an 01 A6 2.8 automatic trans. It was throwing the codes for maf and oil pressure sensor. The car idles at 750, fine in park but rough in drive. When you take off it sputters and backfires until you get in higher gear. Runs fine on the interstate. Also when I fill the tank with gas the pump stops every few seconds.