1999 Ford E-Series Van

Engine Mechanical problem
1999 Ford E-Series Van V8 Two Wheel Drive Automatic 180000 miles

my van started loosing power lately when under a load.I changed two coils a while ago acording to scanner, and it was fine.A couple months later it started hesitating and bucking when going up a incline and under a load. Then today I heard a little knock when idling then a couple hours later I stop for a while, when I got back in the van and started it up a loud popping sound started like a bad exhaust leak, by the time I got home and checked it out I found my spark plug laying on top of the block my coil broke away from the block and the spark plug electrode was pressing against the end of the tip.I tried to screw in another plug I had but it seams the threads on the head are stripped. What do you suggest I could do.
February 6, 2009.

Go to the parts store, and buy a plug thread repair kit.

Feb 6, 2009.