1. Fuel pump: The fuel pump may be faulty and not delivering enough fuel to the engine. Check the fuel pressure and replace the fuel pump if necessary.
2. Fuel filter: The fuel filter may be clogged and restricting fuel flow to the engine. Replace the fuel filter if necessary.
3. Fuel injectors: The fuel injectors may be clogged or faulty and not delivering enough fuel to the engine. Clean or replace the fuel injectors as necessary.
4. Mass air flow sensor: The mass air flow (MAF) sensor may be faulty and providing incorrect information to the engine's computer about the amount of air entering the engine. This can cause the engine to run too lean (not enough fuel) or too rich (too much fuel). Clean or replace the MAF sensor as necessary.
5. Oxygen sensor: The oxygen sensor may be faulty and providing incorrect information to the engine's computer about the amount of oxygen in the exhaust. This can cause the engine to run too lean or too rich. Replace the oxygen sensor as necessary.
6. Idle air control valve: The idle air control (IAC) valve may be faulty and not allowing enough air to enter the engine at idle. This can cause the engine to stall when the throttle is closed. Clean or replace the IAC valve as necessary.
7. Vacuum leak: A vacuum leak can cause the engine to run too lean and stall. Check for and repair any vacuum leaks.
