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 ...

Where distributor caps and rotors once needed replacement, electronic ignitions typically keep on firing. In new vehicles, spark-plug replacement intervals are often around 100,000 miles.

Spark plugs, which screw into the top of an engine ... A fouled, worn or loose plug can cause rough running or abnormal noises. Longer replacement intervals, typically around 100,000 miles ...