I would just pull them all and gap them. You can't do random plugs because it can only take one plug out of whack to cause slight vibrations! Get a wire gap tool, not those climb the mountain slider gap tools that are $.97 at the counter. Not very accurate. They are for those "Close Enough" kind of people. My uncle is that way....lol If the vibration bothers you, then it's not a good enough routine goin on!
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