Where are the spark plugs located on a 2004 Chevy Colorado?

The spark plugs on a 2004 Chevy Colorado are located on top of the engine, under the valve covers. To access them, you'll need to remove the valve covers. The exact location will depend slightly on the engine (2.2L, 2.8L, or 3.5L). Consult a repair manual specific to your engine size for precise placement and detailed instructions.