Will crank and run and then shut itself off

There are a number of things that could cause this, so we need to start with checking for codes and find out if there is anything telling us what is there.

This vehicle depending on when it was built could be an OBD II vehicle, so I am attaching each guide to help pull these codes.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://www.2carpros.com/articles/retrieve-trouble-codes-for-chrysler-dodge-plymouth-odb1-1995-and-earlier-car-mini-van-and-light-trucks

Also, here is a guide that will get us started with this issue:

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

I would suggest starting with checking the fuel pressure just to make sure that the pressure is enough to keep the engine running. You may be able to build enough to get it to start but it then cuts off.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Lastly, we need to remove and inspect the idle air control if there are no codes, plus the EGR valve as well.

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

I am attaching the info needed to run through this testing so let us know what info you find, and we can go from there. Thanks