Spark plugs are electrical devices that fit into your cylinder heads of your engines and help ignite an air-fuel mixture by creating a spark. Their main function is to produce this spark at the right time. Heat and pressure react to create spark. Without this spark, your car won’t be able to start – and therefore, you’ll be stuck. If your spark plugs start to go bad, then your engine may show you with symptoms like misfiring. Shop our inventory of replacement spark plugs today.