Hi jcolone, Welcome to 2carpros and TY for the donation
Clean out the throttle plate and the idle air control valve and do below
4.6L
Resetting of IAC valve pintle is the only adjustment that can be performed. To reset IAC valve pintle position, start and idle engine for 15 seconds. Turn ignition off and wait 15 seconds. Restart engine and ensure idle speed is correct.
5.7L (Automatic Transmission)
Resetting of IAC valve pintle is the only adjustment that can be performed. To reset IAC valve pintle position, turn off A/C controls. Apply parking brake and block drive wheels. Start engine and allow it to reach normal operating temperature. Place gear selector in Drive. Allow engine to idle for 5 minutes. Place gear selector in Park. Allow engine to idle for an additional 5 minutes. Turn engine off for 30 seconds.
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Friday, September 10th, 2010 AT 6:47 AM