So it was time for new plugs in my 2007 Ford F150 (5.4L V8). I went with the Champion (1 piece) plugs. After about a week, I had an issue with rough idle and acceleration. I through another emission code and had it read.....misfire on cylinder 2. I went with a change in coil pack but it didnt help, so I replaced the plug. Everything went well for about 3 weeks. That brings me to this morning, when I cranked up and it started all over again. I havent had the code read yet....but I am wondering what your guys thoughts would be. If its cylinder 2 again....I am thinking a fuel injector. If its another plug....then do I replace it and keep going? It just seems weird that new plugs (especially these high dollar top of the line ones) would keep fouling without some underlying issue.