Hello all. After searching and trying some of the other troubleshooting ideas, I am open for suggestions. I have a 1988 IROC Convert, 305 TPI, 108000 miles, mostly stock. It has been running rich (Exhaust is rank) drives rough (Constantly adjusting pedal to get power) and throwing a code 34. MAF Voltages are pretty normal, .8V at 1200 RPM (The lowest I can get it), and 3.8V at 4500 RPM. TPS voltages also in spec. New plugs, wires, air filters etc. Runs great in cold weather, crappy in the summer. Fuel pressure good, timing is next to perfect with light. Very frustrated, any help or ideas appreciated. Add code 33 to the mix after it's run for a while.

 

34-MAF issue

How is old is the O2 sensor? It's cheap, change it.

Have you performed the Min Air and TPS Set Procedure together at the same time? If not, start over and see this set procedure and follow it.

https://www.thirdgen.org/newdesign/tech/tpimod2.shtml

 

I'll give that a shot. Air screw never tampered with, factory cover in place. I'll run through the procedure on both. Had the same though on the O2... So I changed it. Brand new. No difference.
Thanks.