I would say valve cover gaskets also. IF the head gaskets were leaking they leak to the rear on the rt head tnd the front of the left head. This was most common on 99 5.4s rt side head not to common on other years or engines.
The most common 3 digit codes are
p0128-coolant temp too low-t stat stuck open
p0171 p0174- lean banks 1 and 2 1=passenger 2= drivers side
p030x- x = cyl number misfire generally coil, plug or wire
cyl numbers front to back pasenger side [rt] 1-2-3-4 drivers [left] 5-6-7-8
p035x x =cyl...
I work on drivability on ford v8s all the time and you can not predict when the coils will fail-new or old. I have had coils only last 2 miles and others have 300k miles on them so if they are not broke dont fix them. I would just carry a small code reader and 2 extra coils and you should be fine.
Hi my name is Pat and my wifes name is Carol [hence the username]. I am a Ford Senior master tech and just got a well used 98 expedition EB 4x4. I hope to find and give good info on this forum to improve my Expedition.
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