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I`m "lucky" as I have the 2003 F150 / 5.4 two valve truck . If you visit the F150 Forum and use their search tab for spark plug blowing out or something similar ... pull up a chair , get some coffee and start reading . As MacVABCH said , this is a major problem with the three valve engine ... and at its worst will actually blow the plug out of the head . There are also some pretty good links on that site on how and what to do to fix any problems you run into . Looks like Ford didn`t have a better idea here .
I plan on changing my plugs this spring at about 50 k miles ... but there can also be problems with the Aluminum heads and the plugs on the two valve engine .
Sorry you had the problem , but you aren`t alone on this .
Bob
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