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Duralast products are engineered for original equipment and replacement applications. Every component either matches or improves on the OE design to ensure fast easy installation superior performance and reliability. When not replaced or maintained properly the vehicle could experience any of the following: no/hard start long crank time misfire lack of power inconsistent transmission shift points spark plug fouling catalytic converter failure poor fuel economy check engine light illumination Import and/or domestic applications available Designed and manufactured to operate reliably under all operating conditions and throughout the entire engine speed range for peak engine performance Designed to meet or exceed OE specifications in form fit and function Coils produce the high voltage necessary to ignite the air/fuel mixture in the combustion chamber