Both V6 engines have 6 spark plugs
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take off the plastic cover and under where the silver cover on the engine says ecotech is where the spark plugs are located
there are 3 in the front and 3 in the back if its a 6cyl.
Fuel and air filters.
The Spark Plugs are located under the resonator box in the center of the engine (its the rectangular black box on top of the engine)
If your're using ACDelco Platinum Spark Plugs the gap is .040".
How to change the spark plugs
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Disconnect the battery, remove the spark plug cables and boots, and remove the old spark plugs. Put in the new spark plugs, attach the boots and cables, and connect the battery.
spark plugs and wires that's it
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.
they are located in the engine block. You'll need an extension to the wrench in order to get them out.