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what are the time intervals you should have between changing plugs and cables?
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It depends on what type of plugs you have. If you use platinums, they can last around 100k miles from what I've been told. I would inspect the wires and look for any possible damage, but they probably don't need to be replaced. I believe the maintenance intervals for plugs are around 30k miles, but that is excessive changing of your plugs (and a waste of money IMO) if you are using NGK plats.