It Just poped up one day on my GF's 89 RS. Under the hood is a 355 TPI with a harness from an 89 Iroc. I was good last year and this year it just showed up. I checked all connections today and it was ok. I had a few extra relays laying around, so I changed out the MAF burnoff relay since thats what the code is, but the problem is still there. I also swapped out the power relay and that didnt do anything eather. I swapped in another MAF I had laying around and no dice. I even swapped in an extra 165 ECM I had with no luck as well. Any ideas of clues? Thanks!