High Performance Ignition Coils for Chevrolet Trailblazer EXT (2003-2004) 5.3LHigh Output Ignition Coils for 2003 2004 Chevrolet Trailblazer EXT (LM4 GMT370) Direct OEM replacement electronic ignition coils designed to cure intermittent misfires and restore reliable spark delivery to the 5. 3L V8. The Stock Trailblazer LM4 Ignition Weakness Over thousands of miles and countless thermal cycles, the OEM ignition coils on Gen III 5. 3L LM4 engines are prone to internal resistance degradation. Heat soak from the GMT370 engine bay
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High Performance Ignition Coils for Chevrolet Trailblazer EXT (2003-2004) 5.3L