My check engine light didn't come on yet, so I'll just keep running it until I know what cylender is missing. I've been through this before. I have a feeling it is that same as yours. I'll replace the coil pack and plug and it should be good for awhile.
As far as the plug issue. Yes, I am aware of that issue. It was a concern to me at first too. However, the problem really doesn't happen that often. When you think of how many 5.4L are on the road between trucks and the SUV's, there really are only a hand full of problems. I have no idea why Ford made the threads so shallow.
If you haven't replaced the coil pack yet, they are easy (except for the back ones). All you do is unplug the wiring, remove the one bolt that holds them in place, and it will pull right out. THe fuel rail looks like it will be in your way, but you'll find there is a lot of room once the bolt is out.
Let me know if you have questions or run into trouble.
Wednesday, June 9th, 2010 AT 6:22 PM