Join Date: Jan 2008
Location: Hudson's Hope, BC
If it ain't broke don't fix it. And since you have the ESP, if you have trouble with them, get Ford to screw with them. Thats the advice I think you'll get anywhere.
My 07 F-150 is my first 5.4l but my Dad has had three. Our 97 F-150 went to 160k (before it burned up), Our 02 had 87k on it before Dad traded that on our 04' F-150 that has 105k. We haven't had any problems with plugs, don't fret too too much.
2007 F-150 Lariat Chrome - HD Taillights, Tinted side windows
1995 F-150 XL - Tinted Windows, Dents, scratches, Eagle Alloy Wheels, Skull Shift knob.