Removal (4.3L)
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 harness connector at ignition control module. See Figure. Remove screws retaining ignition control module and heat sink to bracket. Remove ignition control module and heat sink.