How do I fix my car that starts up and runs but it wont idle It just shuts off

Causes of a Car That Starts but Won't Idle:

Vacuum leak: A hole or crack in the intake or exhaust system that allows air to leak in, causing the engine to run too lean.
Idle air control valve (IACV): A valve that regulates the amount of air that bypasses the throttle plate at idle.
Throttle position sensor (TPS): A sensor that indicates the position of the throttle plate to the engine computer, which adjusts the fuel mixture accordingly.
Fuel pressure: Low fuel pressure can cause the engine to stall.
Ignition problems: Weak spark or a faulty ignition coil can cause the engine to misfire and stall.

Troubleshooting and Repair Steps:

Check for vacuum leaks: Use a smoke machine or spray carburetor cleaner around the intake and exhaust manifolds and listen for a change in idle speed.
Clean the IACV: Remove the IACV and clean it with carburetor cleaner.
Test the TPS: Use a multimeter to test the resistance of the TPS and ensure it sends the correct signal to the engine computer.
Check fuel pressure: Use a fuel pressure gauge to measure the fuel pressure at the fuel rail.
Inspect ignition components: Check the spark plugs, ignition wires, and ignition coil for any damage or wear.

Related Questions and Answers:

Can a dirty air filter cause a car to stall at idle? Yes, a dirty air filter can restrict airflow and cause the engine to run too lean.
What is the purpose of the idle air control valve? To regulate the amount of air that bypasses the throttle plate at idle, ensuring a smooth idle.
How can I check for fuel pressure? Use a fuel pressure gauge connected to the fuel rail.
What are the symptoms of a faulty ignition coil? Weak spark, engine misfiring, and difficulty starting.
Can a vacuum leak cause a car to stall at idle? Yes, a vacuum leak allows unmetered air to enter the engine, causing the engine to run too lean.

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