I was changing the spark plug on my 1998 honda civic Dx. One of the spark plug was real tight. I sprayed some wd40 and turning it slowly. I got it lose but it won't come out.
I would try a torque socket and hit this into the sparkplug hole using a hammer use a extension bar a rachet and undo it it may be best to get the engine hot and soak the spark plug with wd40