Each 2012 Impala ignition coil transforms low battery voltage into thousands of volts to activate the spark plugs and start combustion. Rough idling, reduced MPG, and weakened acceleration are common signs of worn-out coils, and problems with these parts can cause a Check Engine Light or starting trouble too. Shop online for new 2012 Chevy Impala ignition coils and get Free Next Day Delivery or pick up your replacement parts at a local store near you.