Will a PCV Valve Cause Rough Idle

Can a Bad PCV Valve Lead to Rough Idling? Yes, a faulty PCV (Positive Crankcase Ventilation) valve can cause a rough idle by creating a vacuum leak, disrupting the air-fuel mixture, or allowing excess oil into the intake system. If the PCV valve is clogged, stuck open, or broken, the engine may experience misfires, stalling,…