Spark plugs

[Ford78david]

Hey guys just got a 1999 expedition Eddie bauer 4x4 with the 5.4 over 20000 miles runs great did these have normal spark plugs or the ones I have been reading about that break and are a pain to replace? Thank yall

 

[Trainmaster]

The ones in the 1999 don't break. But the heads have very few threads and if the plugs are not tightened correctly they loosen and blow out taking the threads with them. Do your research on these before tou do the replacement.