Car cuts off after starting sometimes or cut off at a complete stop

Hi and thanks for using 2CarPros.com.

If the engine is stalling, has the check engine light come back on? If so, have the same codes returned or something different? Have you confirmed there are no engine vacuum leaks? Here is a link that shows how to check:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Next, the idle air control motor (IAC) is responsible for maintaining the engine idle speed. If it is closed and not working, no air will get to the engine until you pressure the gas. Thus, the engine will stall.

Here are the directions for replacement of the IAC. The first seven pictures correlate with these directions.

REMOVAL
1. Disconnect the vacuum line from the exhaust gas recirculation valve.
2. Disconnect the Idle Air Control (IAC) valve electrical connector.
3. Detach the wiring harness from the IAC valve stud.
4. Disconnect the vacuum supply lines from the upper intake manifold.
5. Remove the IAC valve.
6. Remove and discard the IAC valve gasket.

INSTALLATION
1. To install, reverse the removal procedure.

NOTE: Install a new IAC valve gasket.

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Here are the directions for replacing the EGR. I included it so you can confirm everything was done to specification. The remaining pictures correlate with these directions

PROCEDURES
REMOVAL

1. Remove the air cleaner outlet tube.
1 Disconnect the intake air bypass hose.
2 Disconnect the positive crankcase ventilation hoses.
3 Remove the air cleaner outlet tube.
2. Disconnect the tube from the exhaust gas recirculation valve.
3. Remove the exhaust gas recirculation valve.
^ Disconnect the vacuum hose.

INSTALLATION
1. Clean the gasket faces of the intake manifold and exhaust gas recirculation valve.

CAUTION: When cleaning the gasket faces, do not allow debris to enter the intake manifold or exhaust gas recirculation valve.
2. Install a new exhaust gas recirculation valve gasket.
3. Position the EGR valve and install the bolts.
^ Install the vacuum hose.
4. Connect the EGR tube.
5. Install the idle air control valve.

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I hope this helps. Let me know if you have other questions, need additional help, or if you need additional information.

Take care,
Joe

How do I check for the leaks?

I have already changed the EGR valve and it still have the same issue.

Hi and welcome back. To check for vacuum leaks, follow this link:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Also, you should check the idle air control valve. It is responsible for maintaining the engine idle speed.

One last thing, check to see if the same trouble code is coming up. I realize you replaced the EGR. I need to know if you are still getting an EGR code. When you removed the EGR, did you check the intake and IAC for carbon build up? If the air way is plugged or restricted, the engine won't idle.

Let me know.

Take care,
Joe

It had some built up, but how do I clean that?

You can use carburetor cleaner and a rag to remove it. If there are spots that will not come off, use a gasket cleaner or something similar to scrape it off. Make sure to remove as much as possible.