One on my spark plugs is stuck. what is the best way go get alose. i didnt tighten it down like that,i think i didnt put some silver stuff on it to stop it from doing that. using air tools or impact wrench would hurt the block????

thanks

I wouldn't use any kind of impact wrench or air tool. Spray some penetrating lube, not too much, on it and let it work it's way in a little.

^^^^^As said, no impact wrench/air tools!!!! You bust that sucker off in the block and you really have problems. Try what Sublime suggested, also it might help to try and tighten it ...not too much just a slight turn then try and untighten it... sometime this will help break it free. Another reason to apply the thread lube to the plugs when installing just 99¢ at most auto parts stores. Good luck.

Yeah Anti Sieze!