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1 cause/guess may be that the plugs were too long and the piston pushed them out.if that was the case your would be able to see damage to the plugs,not to mention damage to the pistons . Please look at consumer reports. There is a lot of information about 5.4L Ford engines blowing spark plugs. Speculation is a design flaw, too few threads in the head to properly secure the plugs. Appears to be too common a problem.

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19y ago

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