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Seems to me that rather than reverse-engineer the entire ECU (which I agree is an interesting project in itself), it would be easier to design our own idle speed controller. The IAC motor is a 2-phase stepper - simple enough. Just unplug the IAC motor from the ECU, and plug it into a new idle...
After the key is turned off, there should be no more spark AND no more fuel.
When it is running after the key is switched off, does it run normally - if you hit the gas does it rev up - or is it bucking and stumbling?
When I was a kid on the farm, we had an old combine that would run on, up to a...