Possible causes and solutions:
1. Problem with throttle position sensor:
* The sensor may not accurately transmit throttle position to the engine control unit (ECU).
* Solution: Check and replace the sensor if necessary.
2. Idle Air Control (IAC) valve malfunction:
* The IAC valve controls the idle air supply. A malfunction may cause the engine to stall when shifting into gear.
* Solution: Check and replace the IAC valve if necessary.
3. ECU problem:
* The ECU may not correctly process signals from sensors and control the engine.
* Solution: Read the fault codes and contact a mechanic to diagnose and reprogram the ECU if necessary.
4. Spark plugs or ignition coils:
* Faulty spark plugs or coils can cause a misfire, causing the engine to stall.
* Solution: Check and replace spark plugs and coils if necessary.
5. Fuel pump or filter malfunction:
* Insufficient fuel pressure can lead to starting problems and engine stalling.
* Solution: Check and replace the fuel pump or filter if necessary.
6. Dirty air filter:
* A clogged air filter restricts air flow to the engine, which can lead to trouble idling and stalling.
* Solution: Check and replace the air filter if necessary.
7. Wiring problem:
* Faulty wiring may interfere with signal transmission between the sensors and the ECU.
* Solution: Check all wiring and repair any breaks or shorts.
8. Gearbox malfunction:
*In some cases, transmission problems (such as clutch wear) may cause the engine to stall when the vehicle is engaged.
* Solution: Check and, if necessary, service or repair the gearbox.
9. Traction control system malfunction:
* The traction control system may intervene and shut down the engine if it detects wheel spin.
* Solution: Check the traction control system and disable it if necessary.