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To change the rear spark plugs on a 2004 Mercury Monterey, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the intake manifold or any components obstructing access to the rear spark plugs, then carefully disconnect the spark plug wires. Use a spark plug socket to unscrew the old plugs and replace them with new ones, ensuring they are properly gapped. Reassemble any removed components, reconnect the battery, and start the engine to check for proper operation.

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