I had a 98 with 290 K on it--they were very bad to crack heads--they still run just fine with the cracks but it allows coolant in and that rust the plug in place--once you get it out--replace it every few thou and use lots of anti goo. The plug may even have a green tint from the antifreeze--I broke mine off once..turn the engine over the engine compression will usually "blow" the left over ceremic out of the plug base--now you have a hole in the plug---get the rest good and hot with the torch--drive a square easy out in the hole ( piston down ok..) then as it cools it will come out with some muscle--after that change very often and you are good for many more miles--it sounds and looks rough as you do it--it ain't a pretty way to go but it is what the dealer and other mechanics do as you are in the waiting room--hey..mine was #7--a #5 would be way easier to get to...Good luck!