40 yr ago the head mechanic in the truck shop showed me that trick. If a gas engine is misfiring you pull a plug wire in turn to find the bad cylinder (most people use that "trick"). Then, if you hold the wire so the spark has to jump a gap, and that cylinder starts hitting again, you know the plug is bad or borderline. But if you can't get the cylinder firing again, you have a bigger problem, maybe a bad valve or some similar mechanical problem.
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Today's Featured Article - Engine Basics: Spark Plug Cleaning - by Staff. Cleaning procedures: Brush or blow dirt from around the spark plug base. Remove the plug with a correctly fitted wrench. Examine the porcelain insulator and points. If the insulator appears to be melted or blistered, cracked or broken, and the points seem unduly burned it is evident that the plug is operating too hot and it should be replaced with a colder plug. If the plug is fouled excessively with carbon it apparently is operating too cold and it should be replac
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