2003 Ford Expedition Missing and hesitation

2003 FORD EXPEDITION
111,000 MILES • V8 • 2WD • AUTOMATIC
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FEC
  • MEMBER
  • 2 POSTS
Service engine light came on code said miss fire on #3&6 reset and then only showed for #6 replaced coil & all 8 plugs also replaced fuel filter. Still has intermittent miss at 60 - 70 mph
Sep 7, 2009 at 3:05 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Are you still getting a misfire at the same cylender or is it a different one? Also, did you replace all coil packs or just the two? Finally, did you check all of the plug boots on the coil packs (if the all weren't replaced) to make sure they are not arcking? I have see that cause a problem. The boot gets old and allows the ignition to arc on the valve cover.
Sep 10, 2009 at 5:08 AM
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