idle problem

GTLifE:

The "engine dies when clutch is pushed in" symptom is pretty classical of a bad IAC valve. Now, the new valve could be bad or there could be an electrical problem with the IAC valve. Check the wiring to the IAC valve. Use a 5V DC source to check the IAC valve solenoid (it should toggle on/off as the 5V is applied and removed). Check the air hose connection to the IAC to make sure it has no holes or blockages.

Last thing, check the entire air intake tract to make sure that the temperature sensor is installed and there are no leaks anywhere.

That's about all I can suggest.

HTH,

Chris

Post #3
http://www.stangnet.com/mustang-forums/810729-starts-but-dies-idle-help.html

Since the IAC, TPS, and MAF has already been replaced, consider looking for a vacuum leak.

Next, check the throttle return spring. Any loose or binding?