I have tried to remove the #3 spark plug from my 2001 Malibu, with no results. It is very hard to get to that particular spark plug because there is not much room between the fire wall and cylinder. I somehow broke the top off and the bottom of the spark plug is cracked in half. I tried different tools but still won't come out. There is not enough clearance in the area of the #3 spark plug to fit a drill in there or any other kind of tool. Please help, it's the only car I have, plus I have no money and I know just a enough about cars, to keep mine from going to an auto-repar shop. I was trying to change the plugs for a smog check, which is now past due.
You might want to try a right angle adapter in your drill to give you more room. Here is a link to the sort of thing http://www.screwfix.com/p/angled-drill-chuck-10mm/39590
You could then try the easy out or if that fails [or it snaps off] weld an old ring spanner over the stub of the spark plug, the heat from the weld will help to free the plug. You can place a long tube over the ring spanner to get more leverage so be sure to position it optimally when you weld it on, as it may be the last chance you have to free it.
For stuck plugs use "SeaFoam" brand penetrating oil. It is the best. You may have to let it sit and work for a few days though. I have not seen this engine but it sounds like a tight spot so use a universal off the socket. Also use a 12 sided socket and, to make sure it doesn't skip, lightly grease the inside of the socket and dip it in sand blasting sand then gently tap the socket into place. A socket treated this way will give tight, positive grip and with luck, and a 4 foot snipe, the plug should come out. Worked for me anyways.
If there is no room for drill I would try to do as written in this guide. It seems that this could be a cheap solution for your problem. EZout extractor can be bought on ebay or maybe at your local house tools store. I hope it helps.