we might be in a good place folks (fingers crossed). I forgot about the 10k mode with WINALDL so the idle was higher than I wanted. Without it, it seemed to settle around 750 RPM. I took it out for a few test spins and it seemed to be doing okay. Still might be running a bit rich. I'll replace the O2 sensor since it is 38 years old. I'll report back. thank you :-)

 

Hey Friends. I think we can consider this case closed. I replaced the O2 sensor (it was 38 years old) and it seems to be idling just fine. It is running really well. The original thread was about the stumbling idle. I think it was the vacuum leak in bottom rear intake runner I created when I replaced all the injectors. But, in chasing it down, I pretty much replaced everything! Thanks for all your ideas!

Summary: checked plug wires multiple times. they are numbered on both ends. new wires, new plugs. New distributor, cap, rotor, pickup, ignition control module, coil, IAC, TPS, MAF, EGR valve, PCV. New fuel pump, fuel filter, fuel pressure regulator, and injectors. Verified all plugs receive spark. Verified all injectors receive electrical commands with a noid light. Timing at 8 degrees advanced w/out EST - probably around 20 w/ EST. New O2 sensor. Running great!

 

Thanks for giving final feedback!