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There is no typical PCV valve in these trucks. There is a ventilation tube that is connected to the bottom of the Resonator box that sits on top of the motor. Says "Vortec 4200" on it. When you take the box off to clean the throttle body - yes clean it if you want to correct idle or stumbling when AC is on - you must ensure that it is reconnected along with the fuel Pressure switch vacuum tube.
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