Ignition Coil & Iridium Spark Plugs & Wire GMC Sierra 2500 HD 3500 HD (2020) 6.6L V8High Energy Ignition Coil & Iridium Plug Kit for GMC Sierra 2500 3500 HD Replaces degraded OEM ignition components to restore optimal spark energy, eliminate RFI interference, and cure misfires on the 6. 6L L8T V8 engine. The Stock Sierra HD Ignition Breakdown Under heavy thermal loads from constant towing or prolonged idling, the factory ignition coils and spark plug wires on the T1XX Sierra HD inevitably break down. The stock coil's internal epoxy
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Ignition Coil & Iridium Spark Plugs & Wire GMC Sierra 2500 HD 3500 HD (2020) 6.6L V8