carbon is formed in the spark area. improper ingnition also is an indication of a bad spark plug.
Lack of power or diminished power and a miss that occurs quickly are signs of a bad plug or...
Grip the boot and give it a half to full turn to break the grip that holds it on. There is a special tool made to pull the boots off with, it is best to use it after you break the boot free. If you...
Yes, if the wire is old and frayed or if it is rubbing against metal the wire could ground out and discharge into the engine block before it get to the spark plug causing the plug to misfire. If the...