Spark plug caps are one of the problems that most people overlook.Most caps have a 5000 OHM resistance. If they measure higher or lower than 5000 they should be replaced. They can cause you to drop a cylinder , miss at idle, sputtering down the highway.
NGK caps can be purchased for $3-$8 each. Change your plugs and caps at the same time in case one of the plugs has fouled.
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