+1. If you can't feel slight tension when you are loosening the first plug then I would stop. Don't try to be an Ape man when removing plugs. Slow constant force works for me. Post pics of these plugs when you get them out. I'm curious to see their condition.
Originally Posted by Schmoe
NEVER remove plugs when the engine is even warm. You want ambient temperatures. My experience is not getting them loose, it's actually making sure the plug socket fits securely on the plug before you even begin to loosen. If not, you can round off the plug edges and then you got problems. I always drop the socket with an extension on to the plug and make sure it's on there nice and tight, then hook up ratchet and slowly remove them.