Ignition Control - 4.0L/4.7L: Description
WARNING: This page is about a different car, the 2004 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Two different ignition systems are used. One type of system is for the 4.0L 6-cylinder engine. The other is for the 4.7L V-8 engine.