Why my cars engine shuts down whenever I slow down or stop my car?

There could be many reasons for this. The idle air control valve could be a problem, which regulates the amount of air that flows into the engine when the car is idling. If this valve is not working correctly, it could cause the engine to stall. Another possibility is a problem with the fuel injectors that deliver fuel to the engine. If they are not working correctly, they could cause the engine to stall. Finally, it is also possible that there is a problem with wiring or another electrical component that is causing the engine to shut down. Wiring problems are often difficult to diagnose and repair, so it is important to have your car checked by a qualified mechanic.