my maf sensor wires were all messed up, check to see if the wires are solid or not, mine were all cracked and split up where they had a bend in them right before the plug, the wires inside were all brown and dried out, i ordered a new pig tail and cut the wire from the harness till i got to nice shinny, clean copper wires in the insulation, then soldered them up and shrink wrapped them, no more maf codes after that for me.