it was running fine then one day it just stalled on me after a good drive?

These trucks are famous for failing fuel pumps, but to be sure we can do a fuel pressure test. Here is a guide to help walk you through the steps and a video on how to change out the fuel pump in case you need it:

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

Key On Engine Off 55-62 PSI

You can rent a fuel pressure test kit from the auto parts store for cheap or free in most cases. Please check the video below to see how the change the pump out.

https://youtu.be/VuGxQgWDP-0

Another way to check to see if it is the pump is to see if the engine runs on starting fluid.

Please check out this guide as well:

https://www.2carpros.com/articles/car-not-running-advanced

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

Thank you for all the help so far. I'm in the process of checking out the crank potion sensor. So, my question is, what would the sensor read on a multimeter? It's a three wire one. Basically, need to know how to tell if the sensor is bad or to look elsewhere? Looking forward to hearing back from you.

Old school of thought, will the car run with a touch of starting fluid? Has the fuel filter been changed in a while? With the ethanol in the gas now a days I have seen where the fuel filter screen that is on the fuel pump (in the fuel tank) get clogged and even though the fuel pump runs it will restrict the fuel getting to the engine.

Okay, so I've checked the mass air flow sensor and cleaned it, also the crank position sensor checked and cleaned. I am getting fuel pressure. But Tahoe still won't stay running for more than a m.

But Tahoe won't stay running for more than a minute. But I have been noticing that there is a lot of times the power to everything flickers. Especially if you mess with the wires that are attached or next to the brake pedal. No codes are coming up. I'm going to check all the relays today. It was making a weird noise after starting it up today when I pushed on the brake it would stop. But I'll let you know more soon.

If things flicker when you move the wires by the brake pedal check all the wires one at a time to see if there is a short of a wire follow the wires back to the fuse box. Look around the wires that come down from the ignition.
With a loose wire that could is possible be why the vehicle won't keep on running.
Let me know what you find.

Mike