Thank you Jim. I mean the spark plug. Sorry for not clarifying that. I had one suggestion to start engine and run to temp, then turn it off and work it with the longest breaker bar I can get. I was warned against an impact wrench because you can't "feel" when something is about to break off (leaving the threads behind).
I'll give it another try this spring when it warms up. Thank you again for your help!
John
