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What is wrong with a 2002 Tahoe Chevy runs fine then shuts off after only running for 20 min and turns back on 5 min?

Potential Problems and Solutions

1. Fuel System Issues:

- Clogged fuel filter: Replace the fuel filter if it's dirty or clogged.

- Faulty fuel pump: Test the fuel pressure and replace the fuel pump if necessary.

- Leaking fuel injector: Inspect and replace any leaking fuel injectors.

2. Ignition System Issues:

- Faulty ignition coil: Replace the ignition coil if it's damaged or malfunctioning.

- Worn-out spark plugs: Inspect and replace any worn-out spark plugs.

- Faulty ignition module: Test and replace the ignition module if it's defective.

3. Air Intake System Issues:

- Clogged air filter: Clean or replace the air filter if it's dirty or obstructed.

- Faulty mass air flow sensor (MAF): Clean or replace the MAF sensor if it's dirty or malfunctioning.

4. Temperature Sensor Issues:

- Faulty coolant temperature sensor: Test and replace the coolant temperature sensor if it's malfunctioning. This sensor provides information about the engine's temperature to the vehicle's computer.

5. Electrical System Issues:

- Loose or corroded wiring: Inspect for any loose, disconnected, or corroded wiring in the engine's electrical system.

It's essential to have a qualified mechanic diagnose the exact cause of the issue by checking for trouble codes, inspecting the faulty component, and testing relevant systems, including fuel pressure, ignition, airflow, and emissions.