1.) Locate the ignition control module under the hood. It is a gray box, bolted down with two 10 mm bolts.
2.) Unplug the electrical connector from the bottom of the ignition control module.
3.) Start the engine and set the timing. It should be set to 0 degrees before top dead center (BTDC) for the 5.0L engine and 6 degrees BTDC for the 5.7L engine.
4.) Stop the engine and plug the ignition control module connector back in.