What can cause a Mitsubishi Montero Sport to die on idle?
There are a few potential reasons why a Mitsubishi Montero Sport might die on idle:

1. Faulty idle air control valve (IACV): The IACV controls the amount of air that enters the engine at idle. If the IACV is faulty, it may not be able to regulate the airflow correctly, which can cause the engine to stall.

2. Clogged fuel filter: If the fuel filter is clogged, it can restrict the flow of fuel to the engine, which can cause the engine to stall at idle.

3. Dirty or faulty mass airflow (MAF) sensor: The MAF sensor measures the amount of air entering the engine and sends this information to the engine control module (ECM). If the MAF sensor is dirty or faulty, it may send incorrect information to the ECM, which can cause the engine to stall.

4. Vacuum leak: A vacuum leak can occur when there is an issue with the hoses that regulate air pressure in the engine. This can cause the engine to stall when idling.

5. Faulty battery or alternator: If the battery or alternator is faulty, it may not be able to provide enough power to the engine, which can cause the engine to stall at idle.

6. Faulty idle speed control (ISC) motor: The ISC motor controls the idle speed of the engine. If the ISC motor is faulty, it may not be able to maintain the correct idle speed, which can cause the engine to stall.

If your Mitsubishi Montero Sport is experiencing stalling at idle, it is best to have a qualified mechanic diagnose the issue to determine the root cause and make the necessary repairs.