So original issue start die, low idle at first not the iac.
I replaced fuel filter, recent dist csap, rotor, nonresistor plugs, o2 sensor.
Tested the eha,
flow tested fuel volume(remove outlet connection on regulator, palstic tubing with hose clamp, minimum 1 liter/40 sec into plastic container),
tested temp sensor (4 prong on mine),
checked for vacuum leaks, replaced all small rubber connectors (not iac hoses)
Plan to check fuel pressure (need fittings), check valves at pumps,
check fuel accumulator this way:
Pinch off the 'return' from the accumulator and disconnect.
No fuel should should leak from the accumulator when you turn the key on, put a pan under just in case it's bad.
What I can't figure out on mine:
Have someone start the engine (cold only, warm starts fine).
Airflow plate drops and immediately starts back up, engine dies.
If I hold airflow plate in position (do not let it rise), does not die.
Tryning to figure out that one.
Did you observe the airflow plate in yours at cold start?