You could try running some penetrating oil (WD40, etc)around the plug base, leave overnight or when you use the car, the heat will let it work in a little more. Slide a piece of pipe over the tommy bar to give more leaverage. Make sure you don't tilt the socket when applying force, otherwise you chance breaking the insulator, then if you are unsuccessful, it makes difficult driving with 7 working cylinders to get profesional help.
Pablo
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