Why does a car stall when you stop?

A car may stall when you stop due to several reasons, including insufficient fuel delivery, a malfunctioning ignition system, or issues with the idle air control valve. When the engine isn't receiving the right amount of fuel or air, it can struggle to maintain the necessary RPMs, leading to a stall. Additionally, problems with the transmission can prevent the engine from properly engaging, causing it to shut down when the vehicle comes to a stop. Regular maintenance can help prevent these issues.