My 1998 f150 runs strong at first a minute later runs rough ):Most tell me a coil pack

David Sica

Asked by Mar 02, 2016 at 04:15 PM about the 1998 Ford F-150 XL 4WD Stepside SB

Question type: Maintenance & Repair

Truck runs rough  as soon as it warms up a little like 1 minute.Starts up
running strong

2 Answers


You should get a check engine light and see what code it throws u but if not, sounds more like the egr valve is dirty, check and clean and see if it helps, coil packs can get expensive unless u really need to replace them


Also you can unplug coils one at a time, any change in engine roughness means the coil is good. If no change, its a bad coil. Sometimes you wont get a CEL. Mine didn't

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