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The Ignition Coil in Chevrolet Impala car model is an essential part of the ignition system in automobiles; which function is to change low voltage to high voltage to generate sparks. Impala models slightly older have a single coil that services all cylinders while current models have as many coils as there are cylinders. This improves on reliability and does away with the ignition wires hence enhancing on the performance. Modern ignition coils in automobiles employ the feature of an electronic control and power transistors are incorporated in the unit, and a single coil is used for each cylinder or wasted spark for effectiveness. When the coil fails this means that the engine starts misfiring and loses power and that is why it needs servicing.