- Vacuum leak: A vacuum leak can cause the engine to run lean, which can lead to hesitation and stalling. Check all hoses and connections in the vacuum system for leaks.
- Fuel filter: A clogged fuel filter can restrict the flow of fuel to the engine, which can cause hesitation and stalling. Replace the fuel filter if it is dirty or clogged.
- Spark plugs: Worn spark plugs can cause the engine to misfire, which can lead to hesitation and stalling. Replace the spark plugs if they are worn or damaged.
- Fuel pump: A weak fuel pump can cause the engine to run lean, which can lead to hesitation and stalling. Check the fuel pressure to see if the fuel pump is providing enough pressure.
- Idle air control valve: The idle air control valve (IACV) controls the amount of air that bypasses the throttle plate at idle. A dirty or faulty IACV can cause the engine to stall or run rough at idle. Clean or replace the IACV if it is dirty or faulty.
If you are not able to troubleshoot the problem yourself, take your car to a qualified mechanic for diagnosis and repair.
