aaklingler said:
you can give a pretty good pull with pliers, wiggle it around a little too, also try screwing it out while pulling.
I know one guy who rigged up a rubber tube that fit tight over the plug, and then put the other end in his reversible drill, and ran it in reverse(so as not to screw up the threads)while spraying wd40 and gently pulling up to grind off any carbon that may have built up.
If the tip is bent or swollen, it's probably not gonna come out. I have heard of one guy who got it unscrewed, and pulled up till it was wedged, and then fired the engine up. It fired the plug out, but could just as easily have broke it off, and the danger is of course, the tip can fall in there.
I suggest you read the article, make sure you got that cylinder to TDC, and try to work it first, and if it just won't come out, then only you can decide how much more risk you're willing to take.
It won't hurt anything to just screw it back in there and leave it (electrically unhooked) but you may have trouble starting the truck when cold weather gets here again.
The only for sure way to get it out without harm that anyone has come up with, is to pull the head off.
Good luck, do report back...
Zigg