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To change the spark plugs on a 1997 Subaru Outback, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the engine cover if necessary, then carefully disconnect the ignition wires or coils from the spark plugs. Use a spark plug socket and ratchet to unscrew the old plugs and replace them with new ones, ensuring they are properly gapped. Finally, reconnect the ignition wires or coils and the battery terminal.

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