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Hey!

I bought a used Explorer 6 weeks ago. It ran pretty well, but had some problems along the way like a power steering leak, transmission pan leak, etc...

Now, I have a bigger problem.

The truck will stall right after I start it up. If I rev it to stop it from stalling, it'll surge RPMs like crazy.

However, since I need to get to work, I found a solution. Unplugging the IAC harness makes it driveable... It sometimes stalls at stop lights, but for the most part, it works.. However, I want to fix the issue completely, so please help me out!

Symptoms:

With the IAC plugged in, it'll stall almost right away. With the IAC unplugged, it'll work good enough... occasionally stalling here and there.

Things I have tried:

Checked for vacuum leaks
Tried 2 other IACs
Replaced the TPS
Cleaned the throttle body
Cleaned the MAF

Check Engine Light codes:

KOEO:
111: All okay.

Continuous Memory:
122: TP sensor input is less than Self-Test minimum.
157: MAF sensor circuit open.
158: MAF sensor shorted to power.
211: PIP circuit failure.
543: Fuel Pump Circuit Open.

KOER:
998: Hard fault present.
57: Something wrong with the octane bar?
 
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