Removal (4.2L)
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Disconnect negative battery cable. Remove 2 air cleaner resonator mounting bolts. Loosen air cleaner resonator-to-throttle body clamp. Move air cleaner resonator aside. Disconnect harness connector(s) from ignition coil(s). Remove retaining bolt(s) from ignition coil(s). Remove ignition coil(s) from engine.