What are the reasons for a car stalling at startup?

[McEmma]

Here are the reasons why a car may stall at startup: 1. Theft prevention system is not deactivated; 2. Excessive carbon buildup in the throttle body, spark plugs, cylinders, fuel lines, or intake manifold; 3. Ignition system malfunction; 4. Low-voltage circuit failure; 5. Insufficient cylinder compression; 6. Low fuel level in the tank or insufficient fuel pump pressure; 7. Leaking ignition wires; 8. Engine malfunction; 9. Clogged single or multiple fuel injectors. Additional information: The correct starting method is to first turn the ignition key to the power position, then press the foot brake, shift the gear from P to N, release the foot brake to start the engine, warm up the car in place, press the foot brake again, shift the gear from N to D, release the handbrake, and finally slowly release the foot brake while gently pressing the accelerator to start smoothly.