To change the spark plugs on a 2004 Ford Mustang Mach 1 with a 4.6-liter 32-valve engine, first, ensure the engine is cool and disconnect the battery. Remove the ignition coil covers and then the ignition coils themselves, which will give you access to the spark plugs. Use a spark plug socket to carefully unscrew the old spark plugs, and then install the new ones, ensuring they are properly gapped. Reassemble by reinstalling the coils and covers, and reconnect the battery.
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