Why would your car stall when check engine light comes on at a stop sign then be hard to start again?

When the check engine light comes on, it indicates a potential issue with the vehicle's engine or emissions system. A stall at a stop sign could be caused by a malfunctioning sensor, such as the mass airflow sensor or throttle position sensor, which disrupts the air-fuel mixture. Additionally, a failing fuel pump or ignition system component might prevent the engine from restarting easily. It's essential to have the vehicle diagnosed to identify the specific problem.