1989 IROC Convt 305 TPI been flashing an MAF code for weeks. Experianced shop has replaced a few times, checked all grounds etc... they have determined the ECM should be replaced. Ordered 4 from A-1 Cardone and each make the car run worse with diff codes. I got reccomendation from here for SouthBay Fuel injectors and now looking for additional expertise. Looked at Rockauto.com. Anygood? other places?
Thanks

If you are looking for an ECM, I highly recommend Tuned Performance. They are a sponsor here on TGO. I had to replace my ECM last month and they were awesome to deal with and it got here super fast.

I have only run across two bad ECMs in thirdgens ever. One had been drowned and the other had fallen out of its mount and shook to death. If your having codes I would troubleshoot the suspected codes, and rule them out.

Thanks guys. Looks like Tuned Port does have ECM units on his virtual junkyard page. I have sent him an email asking for additional guidance if possible.
If he doesn't get it maybe he can call me at: eight o three, two three eight, five two, six, two
Ed

Tuned is your guy