Ignition Coil Power Source
WARNING: This page is about a different car, the 1998 GMC Savana, 1998 Chevrolet Chevy Van, and 1998 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition on. Check ignition positive voltage circuit of ignition control module for battery voltage. See WIRING DIAGRAMS - 4.3L article. If battery voltage is not present, check ignition or ECM 1 fuse. If fuse is not blown, check for open between fuse and ignition control module.