Intermittently car surges and then shuts off

Good afternoon,

I would start by cleaning the throttle body as carbon build up could cause the high idle and the stalling

https://www.2carpros.com/articles/throttle-actuator-service

https://www.2carpros.com/articles/stall-at-idle

Another possibility for stalling is the EGR valve. If it sticks and dos not close all the way, it will make it stall on hard braking. To verify, remove the connector on the EGR valve and drive it and see if it stills stalls.

Roy

THROTTLE BODY CLEANING PROCEDURE

1. Remove the air cleaner outlet duct.
2. Remove the air inlet screen, if applicable.
3. Inspect the throttle body bore and the throttle valve plate for deposits. You must open the throttle valve in order to inspect all of the surfaces.

NOTE: Do not subject a throttle body assembly which contains the following components to an immersion cleaner or a strong solvent:
Throttle position (TP) sensor
Idle air control (IAC) valve
Sealed throttle shaft bearings

The cleaners will damage the electric components or sensors.

The cleaners will damage some of these components that contain seals or O-rings.

Solvents can wash away or break down the grease used on non-serviceable throttle shaft bearings.

Never use a wire brush or scraper to clean the throttle body. A wire brush or sharp tools may damage the throttle body components.

Do not use a cleaner that contains methyl ethyl ketone. This extremely strong solvent may damage components and is not necessary for this type of cleaning.

1. Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or an equivalent product.
2. If the deposits are excessive, remove and disassemble the throttle body for cleaning. Refer to Throttle Body Assembly Replacement.
After disassembly, clean the throttle body using a parts cleaning brush. DO NOT immerse the throttle body in any cleaning solvent.
3. If you removed and disassembled the throttle body for cleaning, assemble and install the throttle body. Refer to Throttle Body Assembly Replacement.
4. Install the air inlet screen, if applicable.
5. Install the air cleaner outlet duct.

I attached the picture in my last response.

Just unlug the connector and take it for a ride.

Roy

Keep me updated.

Roy

One step at a time.

Most likely will be coming back to the throttle body.

Roy

Okay, I need that code that was set.

Did you do the throttle body cleaning yet?

Roy

Okay, get some throttle body cleaner while you are there.

Roy