There are 2 bolts on the left side of the resonator.
They are under the air intake resonator. This is the black plastic piece that's sits on the top, center part of your engine.
I have a 2004, colorado, and it dont have a pcv valve, just a hose from the crank to the resonator.
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)
You have to remove the drivers seat and pull up the carpet.
Underneath the resonator box (the black plastic box right before the throttle body).Once the resonator box is removed the spark plugs are located underneath the small rectangular aluminum heat sinks. Remove the long bolt and pull the entire assembly up and out.
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