Having problems with your 2002 GMC Envoy ?
2002 GMC envoy 4.2 6cylinder have now idea where they are located. can't seem and i don't see any wires to follow
I am guessing you are talking about spark plugs take the plastic piece off top of motor you will see the coils lined up they are underneath the coils (only change on cool motor may strip)
Repair Help & Product Troubleshooting for 2002 GMC Envoy
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