To change the spark plugs in a 1994 GMC Sonoma, first, ensure the engine is cool and disconnect the battery. Remove the spark plug wires by pulling them off gently, then use a spark plug socket and ratchet to unscrew the old spark plugs. Install the new plugs by threading them in by hand to avoid cross-threading, then tighten them with the socket. Finally, reconnect the spark plug wires and the battery.
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