s4owle

I have been battling a misfire problem in my #6 cylinder for a while. I found out that my MAF sensor was bad by logging a couple of runs with VAG-COM. After that I disconnected my MAF Drove it around noticed a big difference in power but, when I replaced the MAF with a new one I'm getting zero voltage and a MAF low voltage code. I tried putting the old MAF in but, that one is doing the same thing. Is there a fuse? What is the best way to test the wiring harness? Is there something obvious that I'm overlooking?

Thanks in advance.
2000 S4