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Dee: try most if not all...at your discretion/whatever your comfort level is...of the previous posts; personally, I suggest modifying it a bit, to include the running of the engine, judicious use of PBBlaster, and then TIGHTENING the spark plug just the slightest tenny-weeny-itsty-bitsy bit: sometimes that actually breaks the 'bond' of rust, gunk whatever that's holding the offender in place. To modify pablos' suggestion (mramsoildude), a LONG breaker bar, with GENTLE thrusts, like almost pulsing a few degrees, and THEN trying to loosen the stuck thingy, just might work...I prefer the long, slow steady rhythmic approach, which might take a LOT longer to arrive at your hoped-for goal, with a slow hand and a LOT of attention paid to the object of attention, rather than just a quick gun-and-run, wham-bam-I'm-done-ma'am approach.It's harder and slower but that's okay, with a lot of time on your hands; even if takes an hour or two...or three, it'll be worth all the time and sweat that you put it into it, and you can do it standing up! :>) --PD.