First of all, gap the plugs properly. Second, did you grease the springs and seat them well? And was the battery disconnected while you did it?
2005 F-150 Lariat [Current]
I survived the 5.4L spark plug change and didn't break any!
Gibson stainless performance headers. Flowmaster 40 dual-out muffler. SCT X4 + 5star performance tune.
If you think hiring a good tech is expensive, try hiring a cheap one.