Ignition Coil & Iridium Spark Plugs & Wire GMC Sierra 1500 Limited (2014-2020) 5.3L 6.2L V8High Output Ignition Coil & Iridium Spark Plug Kit for 2014 2020 GMC Sierra What it Does: This complete ignition service kit replaces degraded factory coils, plugs, and wires to restore combustion efficiency, eliminate misfires, and stabilize idle quality in your 5. 3L or 6. 2L EcoTec3 V8. The Stock Sierra Ignition Shortcomings The factory ignition system on the K2XX and T1XX chassis Sierra is highly susceptible to thermal degradation and electrical
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