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To replace the spark plugs on a 1994 Infiniti Q45, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil covers, then carefully detach the ignition coils from the spark plugs. Using a spark plug socket and ratchet, unscrew the old spark plugs and replace them with new ones, ensuring they are properly gapped. Reassemble the ignition coils and covers, reconnect the battery, and start the engine to check for smooth operation.

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