Any good tips on getting a seized spark plug out? I've had a weird misfire lately, and figured I'd change the plugs to start with. Well, all came out fine except #3, which feels like it's about ready to twist off. I haven't taken it that far yet, and don't want to.

Would an impact wrench help or hurt?

Tried it with the engine warm and cold. Sprayed PB Blaster around it. Tried working it back and forth (loosen, tighten). Still no go.

The plug isn't broken off yet, but I feel if I turn much harder, it will.

Any ideas would be appreciated.

Curt Shambeau
87 Mitsubishi Montero SWB (Turbo G64b wideblock conversion soon)