start with the basics. forget everything
Agree (Aiir, Fuel, Spark, Compression).
Fuel is easy, can run around again with a Fuel / Pressure guage taped to window..
Spark another issue. Have thought of getting some extra long plug wires and inline spark tester and also taping to window.
Once it dies, no better than where I'm at.
Use a stethoscope and in-line LED for injector pulse.
Scan tool worthless, no codes.
Right NOW, see post #56, few minutes ago, this car is dead in the garage.
If the IAC was the problem you would be able to start the vehicle by opening the throttle by the gas pedal and bypass the iac so I don't think that would be your problem. The Iac could be a problem if it stalls when you come to a stop because of throttle body coking but it should still start up afterward. (do a minimum idle test to check for coking)
Did try you pedal to the metal to try and start. Got a pop -- not sure what.
After than checked TB inlet. Interestingly the "back side" of the flapper and an oily residue.
Cleaned it an TB area I could reach with gas, so clean now.
It could be possible that you have more than just one problem.
BTW have been using the forum link I gave you to try and keep things in one place for record purposes.