P304 Diagnostic Code for 2005 Chevrolet Colorado: Misfire and Check Engine Light

Model: 2005 Colorado Fault Code: P2005 Posted: 2008-03-29 11:33

I'm experiencing a P304 diagnostic code on my 2005 Chevrolet Colorado, which has triggered the check engine light and intermittent misfires. I've already replaced the oxygen sensor and tested individual spark plugs and coil packs by swapping them with known-good components—no improvement in symptoms or clearing of the code. The issue persists and does not shift when parts are changed. I'm looking for guidance on what other potential causes to investigate next, such as fuel injector issues, intake manifold leaks, or problems with the engine's ignition system beyond just plugs and coils. Any experience with this specific P304 code in a 2005 Colorado? Any recommended diagnostic steps? Thanks, R Willey