ECCPP Ignition Coils Round for Buick Cadillac Chevy GMC Hummer Isuzu Pontiac Saab Compatible with UF414 C1512 IC534 (Pack of 4) Preventing the ignition coil being heated or damp Turning off the ignition coil when the engine does not work Checking, clearing the ignition coil and tightening the connector in order to avoid short circuit or ground Controlling the engine capability to prevent excerssive voltage Changing the spark plug regularly