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I kept looking for the ignition computer in your list of replacement items; I take it the ECU was the LH2.4 controller (-951 or what's the other one...).
Plugs could be black for missing spark too but I can't think of anything in the ignition system you haven't already replaced that would consistently remove spark after warm up period.
If the notch doesn't show up, it could be the vibration damper has come unglued and is no longer reporting the correct position with its notch.
Not common on cars after 88, but a fault in the wiring harness or mangled connector pin could keep the signal from your ECT from arriving at the ECU and EZ-116K ignition computer. To check you should be able to measure its resistance at the computers' plugs, pin 2 on the ignition computer and pin 13 on the fuel computer. The charts temp vs. resistance are in Bentley.
Read your post twice and I still, like you, wanna blame fuel. I hope the timimg mark not even making an appearance is just a red herring due to an unglued damper. Haven't tried it myself, but I suppose you could double check by aiming the light at the cam gear with the timing cover removed. Can't be that far off if it runs well cold. Fuel pressure could still be high if return line is blocked.
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Art Benstein near Baltimore
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