Corrosion, rust, and grime often accumulate on plug wires and can cause just as much trouble as old spark plugs themselves. If it's broken, cracked, misshapen, or otherwise damaged, now is a good time ...

Some cars equipped with ultra-long-life iridium plugs could take over 80,000 to 100,000 miles before needing a replacement. Meanwhile, spark plug cables or coil packs are usually made of ...