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Spark plugs are an essential component in internal combustion engines, igniting the air-fuel mixture to power automotive vehicles. They are typically made up of a central electrode surrounded by a porcelain insulator, which is housed within a metal shell. Spark plugs play a crucial role in ensuring efficient fuel combustion and reducing harmful emissions. During automotive restoration projects, worn or damaged spark plugs may need to be replaced to restore the engine's performance and fuel efficiency. While spark plugs are not directly related to fuel injectors, they work together to optimize engine performance by providing a precise spark at the right moment for efficient fuel ignition.