What could cause a wrx to nearly stall when clutch is pushed in?

A WRX nearly stalling when the clutch is pushed in could be caused by several factors, including a malfunctioning idle air control valve, which regulates engine idle speed, or vacuum leaks that disrupt the air-fuel mixture. Additionally, issues with the fuel system, such as a clogged fuel filter or failing fuel pump, can lead to inadequate fuel delivery. Lastly, a faulty or worn-out clutch could also cause engagement issues, leading to a drop in engine RPM when the clutch is disengaged.