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Hi JR,
If you've never heard a vacuum leak through your stethoscope, you might wish to create one for the reference. Somehow I missed the clue that your engine stalled at idle, so I was envisioning a less daunting task. If you can't keep it idling, it sounds to me more serious than a mere crack in the manifold gasket.
The O2 Sensor, which I called the Lambda sond in my last post, is the only device that conveys mixture information (or any feedback) to your fuel computer. It functions idling or driving. Without the sensor, the car might run pretty well by AMM alone, but worse, with a sensor providing bogus info, the computer may steer the mixture in the wrong direction very quickly after ECU reset - but not immediately.
You'll have to convince me with some more details about the "checks good on the bench" part of your AMM diagnostics. There are no valid assumptions regarding method among shadetrees, or pros for that matter, on anything more intricate than checking tire pressure. Oil all the way back to the air box on a '93? Do you have serious blowby? Done any compression checks? "Severely contaminated air filter" needs some explanation, if you're not talking about road dirt.
Interrupting the ECU/FI power at fuse 6 does the same as lifting the battery post, with the advantage of not losing your radio presets or getting your hands dirty. I was sort of interested in how you were resetting the codes, as this detail was not mentioned.
--
Art Benstein near Baltimore
When a clock is hungry, it goes back four seconds.
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