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Message: <blockquote data-quote="shovel" data-source="post: 1543381" data-attributes="member: 29855">There is no distributor on a 3.8.    there is no value in swapping plug wires around on the coil pack because it's waste spark.   A competent mechanic would know that.    You measure across the three primary and three secondary coils for continuity and dc resistance.   You inspect for cracks in the potting, and if it passes all that you do a dark room and pull the wires one at a time and check that all 6 behave exactly the same.   EGR is all visual inspection and leak testing and manual vacuum test on the diaphragm.  It would be wise to inspect the evap solenoid and hoses too.  If they're original it's about a 100% chance those need replacement anyway but a stuck open solenoid and deteriorated hose to the canister would mean a wandering idle and misfire at part throttle.</blockquote>