I have an 88 GTA, 305 TPI. I bought this car non-running, and have been tinkering with it for about a year.

The engine idled unevenly at times, OK at others, and was hard to start once I started driving it every day. She also had a tendency to buck at low speeds, but over 10 mph the car ran well. After reading a lot of different threads, I decided to replace the original injectors with Bosch III's.

The hard starting problem seemed to be solved, but the car still ran unevenly at idle and bucked at low speeds. When I pulled the MAF sensor connector, the engine smoothed right out. So, I ordered one, and installed it. That did not solve it.

Next, I pulled codes, and got 44, lean 02 sensor. Since I had no idea how long that had been in place, I replaced it. No help.

I finally ordered an ALDL cable and downloaded TunerPro software. It took me a while to figure out how to get it to work, but once I did, I cleared the codes, ran the engine for several minutes, and read the data.

These are the notable readings that I got, with the car running, in real time:

• coolant temp: -39.99*C
• Startup coolant temp: 227.93*C
• BLM 158
• INT 160
• Code 33 MAF high
• Code 44 02 sensor low

So I replaced the coolant temp sensor, which I believed had utterly failed.

Again, no help.
Once again, I hooked up the laptop. The readings were the same as before.

Could I have a bad ECM? Am I doing something wrong with TunerPro? I have lots of mechanical and electrical/electronics experience, but almost none with TPI.

I would be grateful for any help anyone could provide.