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Spark plugs ignite the air and fuel mixture in every cylinder of a gasoline engine. When they wear out, the engine runs rough and wastes fuel. This guide explains the plug types, the signs of wear and how to replace them. What spark plugs do Each plug creates a spark across a small gap at exactly the right moment. Over time, the electrodes wear, the gap widens and deposits build up, so the spark gets weaker and the engine runs worse. Types of spa …