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My truck is an 02 250 SD 5.4. It has 83K. I have had an issue with stumbling on acceleration. If you ease off it will clear up but get on it then it misses badly. I had this before but found either a bad coil or moisture in the plug hole. i pulled them all. ohmed thhe coils. WD40d the holes after blowing them out. It started last Saturday. After driving a couple minutes it was faint then has aggressively gotten worse. it has new plugs. No codes and idles perfectly. i know this covers a wide array of answers but anyone have any personal experience with this? I have put a can of sea foam in it but use Lucas about once a month anyway.
