Bob

On the 5.4 ford motor. I have went thru this mess with a plug coming out. I don't think it has any thing to do when you change your plugs. Mine came out at around 75.000 miles. I took it to a ford dealer and they put a Helacoil in it. If someone including a Ford Garage, does this, that shop IS NOT FOLLOWING a TSB put out by Ford Motor Company. A Helacoil was put in mine by a ford garage and it did not stay in the head. It came out about 10 thousand mile's later. I ended up replacing the whole head. When the head came off I found out there is only about 4 or 5 threads holding a plug in. Oh yea new plugs cost me around 800.00 but this include 2 coils, there are 8 on a 5.4 and sometime or another you get to replace them all. If my truck , a 2002 supper crew cab , was not free and clear, I would get rid of it. I worry about this one thing every time I take it on a long trip.

here is more info on this matter:

http://www.locknstitch.com/FT%20pdf%...20Bulletin.pdf

http://www.locknstitch.com/sparkpluginserts.htm

http://www.f150online.com/forums/v8-...t-problem.html

Hope this help's you in someway. Oh yea hows the fishing?

Billy