Removal (4.8, 5.3 & 6.0L)
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Disconnect negative battery cable. Disconnect Idle Air Control (IAC) valve harness connector. Remove IAC valve mounting screws. Remove IAC valve and "O" ring from throttle body unit.