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They are located along the top of the motor under coil packs that fire the plugs. You have to remove the resonator box from the top of the motor to gain access. Each coil pack is secured with two long skinny bolts and must be removed carefully. Then simply lift it off and remove the plug directly underneath it. Use only AC Delco iridium plugs. 100k mile intervals.

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17y ago
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Q: How do you change spark plugs on a 2002 envoy?
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