If the PCV valve is stuck in the open position, a lean air/fuel ratio may cause a rough idle or engine stalling.

Question

Quizplus · Accepted Answer

When the PCV (Positive Crankcase Ventilation) valve is stuck open, it can allow too much air to enter the engine. This excess air can lean out the air/fuel mixture, leading to a rough idle or engine stalling because the engine isn't receiving the correct balance of air and fuel for optimal operation.

If the PCV Valve Is Stuck in the Open Position