awhile back i was having issues with my MAF. Code 41 was coming up and real rough idle. I replaced MAF with a $6 used unit from Ebay. Happy days for a few months, but then engine light and code 41 came up again. Josh suggested my computer was having issues and hinted the problem might be there instead.

 

My question: should I try another used MAF on the internet ($80 this time) and give it another shot, or is there some other way to determine if this problem is the computer and not the part? Other than the eng lit being on all the time (after clearning the memory), the car drives mostly great, just rough idle at cold start sometimes.

If the car's running fine, I wouldn't bother with another maf. That code is for the a/f learning control, which is tied to the ECU. You'd be better off trying another ecu IMO.