Well, I was going to pick up the parts yesterday, but went to a wedding Saturday and everyone ended up with mild food poisoning. So I did not. Hoping over lunch today, though.
Wanted to give you a brief update. The car is running... somewhat. I've been messing with the AFM a bit - cleaned it, adjusted the little copper arms so they're on a clean track, tightened it up a bit, refit the contacts. I also removed the questionable ignition relay I installed a while back, just to eliminate it from the equation. Basically following advice from an MG guru I know - "What was the last thing you f*cked with?"
It'll warm up fine and even run smoothly if I have the idle up around 1500 or so. It WILL eventually begin to miss and stall. If I unplug the O2 sensor it'll smooth out. It's also running VERY advanced timing. It's set at the M mark on the crank and if I retard it at all it'll begin to miss and die. I confirmed TDC on #1 and the distributor mark is in the right spot, as are the cam timing marks. At this point it's running super rich - enough to burn your eyes - but that's the only way it'll run. High idle, advanced timing, no O2 sensor. I can pull/plug the retard vacuum hose and it'll jump up a few more degrees. All six injectors are firing (I can hear them clicking away using my stethoscope) and all six plugs are sparking. This has to be a mixture issue, right? Which would again come down to the AFM or ECU. There's no gas on the plugs although they're very sooty, and no gas in the cylinders after it dies. Starts easily without the CSI plugged in (I also confirmed it is NOT leaking).
Do you see a smoking gun in the clues?
as good as a car can be... briefly.