A spark plug is a device that delivers an electric spark into the combustion chamber of your engine. It ignites the compressed mixture of fuel and air, causing the pistons to move up and down. The power from the pistons is what ultimately keeps your car moving. We recommend getting your spark plugs checked every 30,000 miles. However, if you are having problems starting your car, or it makes noises while idling, chances are your spark plugs are misfiring. Replacing your spark plugs is part of routine maintenance. If left unchecked, engine performance and fuel efficiency will suffer. If ignored long enough, damaged spark plugs can be extremely difficult or even impossible to remove when the time comes. Without a spark, your car won’t start or might stall, leaving you stranded. From an environmental point of view, fully functioning spark plugs will not only save gas but reduce air pollution.