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To change the spark plugs in a GMC Envoy, first ensure the engine is cool and disconnect the negative battery cable. Remove the ignition coil by unscrewing the bolts and gently pulling it off the spark plug. Use a spark plug socket and ratchet to unscrew the old spark plug, then install the new one by hand to avoid cross-threading, followed by tightening it with a torque wrench to the manufacturer's specifications. Finally, reattach the ignition coil and reconnect the battery cable.

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