Re: Diagnosis?
Do a compression test across all 6 cylinders (I know, what a fun afternoon that's gonna be..) After that..if you can..do a leak-down test. That low #5 makes my inner-greasemonkey worry a tad..
If you're convinced it's ignition related, a new coil pack, plugs (properly gapped motorcrafts, please...these trucks seem to run best on OEM plugs) and wires are your best friend.
Additionally, your misfire could be caused by a blown head gasket. (I had a similar #6 misfire that I couldn't track down, til a leak-down test revealed it.)
Things worth considering, at any rate.
Keep us posted, amigo, and best of luck!
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Illegitimati Non Carborundum!
(Don't let the bastards grind you down!)
2003 Edge x-cab, 3.0FFV, 5R44E, RW, 4.10 gears
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