Runs Rough/Misses

WARNING: This page is about a different car, the 1995 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.

Check ignition system. See BASIC TESTING - 3.0L article.
Check fuel delivery system. See SYSTEM/COMPONENT TESTS article.
Check EGR system. See SYSTEM/COMPONENT TESTS article.