Hey guys, I just had one of my plugs blow out of the cylinder. I have just over 130,000 on my 5.4 and the plugs were all replaced by my shop when my coils went bad a few thousand miles ago. At first I thought it was my valves rattling and I was dreading what it would cost me to get a valve job. Over the next few days the rattling got progressively worse. The rattling wasn't too bad (I couldn't hear it when my windows were up) but it was clearly heard while the engine was running. Then while I was driving it just popped out. So for all the guys with the first generation Tritons, just listen for what sounds like a rattling valve.
My shop says exactly what a lot of you are saying, it does happen, but not nearly as often as many make it seem. I'm kinda perturbed that the plugs my shop installed popped out in only a few thousand miles, but I just don't have the time to do every repair myself... plus the whole competency thing (or lack thereof), I'm no professional yet. Haha.