Ignition Coil & Iridium Spark Plugs for Hummer H3 H3T (2007-2010) 3.7L I5Reliable Ignition Coils & Iridium Spark Plugs for 2007 2010 Hummer H3 (LLR GMT345) What it Does: This complete 5 pack of ignition coils and iridium spark plugs replaces degraded OEM ignition components to restore optimal spark timing, combat misfires, and stabilize the 3. 7L engine idle. The Stock GMT345 Ignition Weakness The factory ignition system on the 3. 7L Atlas LLR engine is highly susceptible to thermal degradation. Enduring relentless heat
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