Spark plugs are essential in ensuring that your vehicle performs at its best. If yours need changed, and you want to do it ...

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 ...

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.