That's awesome, thanks for taking the time to research that.
I've finally been able to spend some "quality time" methodically troubleshooting. Step one was to put my stock multec injectors in and revert to stock cranking tables and injector characterization. That made zero difference.
Continuing on, the first thing I found is that my fuel pressure was hovering around 50-52psi while the pump was running (engine not running). After the pump switched off pressure dropped immediately to 42-44 and held. Leakdown was about 2 psi every 10 minutes. I'm kind of embarrassed that I didn't check fuel pressure sooner - I thought I had when this problem first started to materialize but I guess I didn't. Anyway, I replaced it with a 3 bar regulator I happened to have in my parts bin that fit and now the pressure maxes out at 42-44 and holds at 42 after the pump stops running.
The other simple thing I hadn't looked at very recently was plugs. They were a little wet and fouled, but I wanted to try and salvage them since they're almost new AC double platinum 41-906s. Cleaning the first one with carb cleaner I then hooked it up with a grounding clip and tested the spark by hooking up my spare opti and spinning it by hand (with the injector and fuel pump fuses out). All I can say is I'm confused. The spark kernel was seemingly avoiding the platinum discs and jumping from the perimeter of the center electrode to the outsides of the ground electrode in an orange-ish ball. Very odd... I took some 600 grit wet or dry paper and cleaned up the platinum discs but if anything that made it worse. So a dirt cheap set of NGK TR55s were bought, gapped to 0.045 and a hot blue spark was witnessed.
Planning to finish installing the plugs and the new O2s tomorrow, will report back soon.
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