Engine keeps shutting off

There are a number of things this could be, but we need to start by checking the fuel pressure when this is happening.

Here is a guide that will help with checking the pressure:

https://www.2carpros.com/articles/how-to-check-wiring

Once we know what the pressure is doing when this happens, we can make a better decision.

However, there are a couple other things that we need to check as well. This would be if the theft system remained active.

If the engine starts and stalls, then this would be a theft issue as well.

https://www.2carpros.com/articles/how-to-reset-a-security-system

The last thing that would make sense is an idle air control valve.

I would suggest replacing it but here are a couple guides for this as well as I am attaching the info below on how to test it:

https://www.2carpros.com/articles/idle-air-control-valve-service

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Please run through this info and let us know what you find. Thanks