I keep getting a Code 36. I have changed the MAF Sensor twice, the first time was for Code 34 and now I keep getting Code 36. The Book tells me that it is the MAF burn off circuit. I thought the burn off curcuit was in the MAF Sensor. If its not in there, where is it?
The Z runs good even with the Check Engine light on. Its hard starting sometimes.

1988 IROC-Z, VIN 8

I had this same problem. Turned out it was the ECM was defective. Once replaced, problem never occurred again.

Thanks,
I did find the MAF Burn Off relay. It is on the firewall behind the mastercylinder. I also replaced the ECM and put in a Fast chip. The car runs strong now.