99 infiniti Qx4 change spark plugs truck?

To change the spark plugs on a 1999 Infiniti QX4, first, ensure the engine is cool and disconnect the battery. Remove the engine cover if applicable, then access the spark plugs by removing the ignition coils or wires. Use a spark plug socket and ratchet to carefully unscrew the old plugs and replace them with new ones, ensuring they are properly gapped. Reassemble everything, reconnect the battery, and start the engine to check for smooth operation.