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Spark plug replacement involves the removal and installation of spark plugs in an internal combustion engine. Spark plugs play a crucial role in igniting the air-fuel mixture within the engine cylinders to power the vehicle. Over time, spark plugs can become worn or fouled, leading to issues such as misfires, rough idling, and decreased fuel efficiency. Regularly replacing spark plugs according to the manufacturer's recommendations is essential for maintaining optimal engine performance and fuel economy.