I changed the plugs on my 04 5.4 with 100K on it yesterday and I'm happy to say I didnt break a single one! I took all the coils off the day before and sprayed PB Blaster down there and then the next day I took them all out according to the TSB instructions. I used the magnetized socket that Napa sells for these 5.4 engines and it worked great. For the new plugs I installed Platinum autolites.

Run good before maybe runs just a tid bit better with new plugs.

 

WOW, congrats. i hope i have that kind of luck when it's my turn to do them.

 

I didn't know Autolite made a plug for the 04-08 5.4. You don't have an 04 heritage do you?

 

They do, I don't have a heritage.