I've had luck by putting a socket ejust big enough to go over the ceramic part and rest on the shoulder. then with a relativly small ball pean, hit the top of the socket straight towardthe threaeds. use solid hits but don't get carried away.. the other trick I've seen with a stuck spark plug was to get the car up to operating temp, shut it off and remove it hot(ouch). theory being the hole will grow in diameter more then the plug. if that doesn't work get a chevy motor...j/k good luck