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Spark plugs are one of the few parts that I tell people that if they suspect they’re bad, just go ahead and replace them. They’re not expensive, easy to replace*, and if you don’t know specifically the last time they were replaced - you’re better off starting to keep track with a new set.
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- some manufacturers make it a pain
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That center electrode looks pretty worn down to me. But my eyes are not a feeler gauge. Check with feelers to be sure.
How often does your owner’s manual say to swap plugs?