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You have a coil that fires both plugs at the same time. If one cylinder fires and the other does not, replace both spark plug caps and the plug on the bad cylinder(or both plugs). In some instances the spark plug dome comes off the plug, is stuck in the plug cap and causes an intermittent spark. you can get it out with a self tapping screw and pliers. If your caps read 5000 ohms keep it as a spare, any other reading throw it away.
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