How do you change spark plugs on 2005 Chevy Colorado?

To change the spark plugs on a 2005 Chevy Colorado, first ensure the engine is cool and disconnect the negative battery cable. Remove the engine cover if necessary, then access the spark plugs by disconnecting the ignition coil connectors and unbolting the coils. Use a spark plug socket and ratchet to carefully remove the old spark plugs, then install the new ones by hand to avoid cross-threading, and tighten them to the manufacturer's specifications. Reassemble the ignition coils and reconnect the battery cable.