Lonnie,
My dad had the same problem once. Here is what he did. He pulled all the plugs, then turned the crankshaft by hand( this was an older car, the fan did not have a clutch)to push the piston up. with a bore scope( I think that's what they're called) and some surgical hemopsats, a bendable prod, was able to manuver the broken part of the sparkplug to where he could grab it with the hemostats. After he pulled it out, he then flushed out the cylinder with water using a small piece of tubing, then vaccumed out the rest using the same tubing hooked to a wet/ dry vaccum cleaner. I think it took him about an hour to do the whole thing. What ever you decide to do, DON'T try to start it!
I don't know if I would want to put water in the cylinder, but you could vacuum it out for any small pieces, You know what, you might try to use vacuum attached to a small tube and see if it will suck up the broken part hard enough for you to pull it through the plug hole. Hope this help some.
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Happy Wheelin'
Ray L.
97 XLT 4X4 4.0L SOHC