To replace the spark plugs on a 1996 GMC Sonoma, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the spark plug wires by gently twisting and pulling them off the plugs. Use a spark plug socket and ratchet to unscrew the old plugs, then insert the new plugs, tightening them to the manufacturer's specifications. Reattach the spark plug wires, reconnect the battery, and start the engine to ensure everything is working properly.
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