4.2L COIL REPLACEMENT GMC Envoy Chevy Trailblazer spark plugs ignition

*GM 4.2L IGNITION COIL 6 PACK : https://amzn.to/36zaRaH
*OEM DELPHI COIL: https://amzn.to/34ila1k
*OEM SPARK PLUGS: https://amzn.to/2Nx3Dx5
*DI-ELECTRIC GREASE: https://amzn.to/2V56W0l
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*MECHANICS TOOLS SET: https://amzn.to/30B7sGW
*TOP SCAN TOOL/CODE READERS: https://amzn.to/2PQIrEF

Quick video showing how I diagnose and replace bad ignition coils on a GM 4.2L engine.

Note: Spark plug gap is .043" `

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