What the...
 

I am the new owner of a 07 F150 w/ a 5.4L, 18560 miles. The day after I bought it I notice during a fairly hard excelleration I get a serious miss and hesitation with some popping ..not sure if it is in the exh or intake. So I take it back to Ford and they say there are no codes but they replace the coil pak on #4, well today it is doing the same thing, anyone have any clues or experience with this!

Tom

I have heard they have problems with losing compression around the spark plugs. The threads around the spark plugs apparently get stripped.