I realy doubt that the plug is rusted off, it's prolly just the cruded over.. Spark plug holes are a magnet for crud, it gets down there and sits, water and or oil turns this mess into baked on crud. Parker Bros sell a product generly refered to as PB blaster, used for all kinds of rusted up things. Soak with Blaster, maybe enough to fill the hole. Come back the next day and blow out with air. Use eye protection. Canned air for computers will work kind of fair, it does usualy come with an extension tube which is real handy. Maybe try high preasure water, anything to get enough crud out so's you can get a socket in there. Don't wory too much about the water it will cook off when the engine reaches running temp. just make sure to blow out any loose crud. You don't want a lot of this stuff falling into the cylinder.
You might try to tighten the plug a little before you try to remove the plug, at least you should be able to tell how good the socket is connecting with the plug. My main advice is to take it slow, don't go all animal on it.
------------------
Ol' Paint, 88 Base coupe auto.
Turning white on top, like owner.
Leaks a little, like owner.
Doesn't smoke, unlike owner
[This message has been edited by DtheC (edited 10-03-2006).]