Quote:
Originally Posted by A930Rocket
Must be the later 5.4's. I changed the plugs on my 2001 F150 with the 5.4 2-3 times starting at 100K the first time. Traded it in a few months ago with 220K and no issues (besides a rebuilt trans at 180K).
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AFAIK, only the 24 valve V8's and 30 valve V10's made before 2009 or so had this problem.