Engine fires and shudders for a second or two then shuts off

Hi and thanks for using 2CarPros.

When you say it turns over easily, do you mean it is cranking faster than usual? If it is, then I suspect the timing chain jumped. However, there are many other things that can cause this issue if the starter speed is the same as always.

First, take a look through this link. It focuses on a crank no start condition.

https://www.2carpros.com/articles/car-cranks-but-wont-start

If nothing there helps, I need you to check two things, fuel pressure and ignition spark. Here is a link that shows in general how to test fuel pressure:

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

Next, here is a link that shows how to check ignition spark:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

If you have spark and fuel, then I need you to check engine compression. This will show if the timing has jumped or even if the compression is too low for the engine to run.

Here are a few links you may find helpful. Also, the last link shows how in general compression is tested.

https://www.2carpros.com/articles/the-reasons-for-low-compression

https://www.2carpros.com/articles/symptoms-of-low-compression

https://www.2carpros.com/articles/how-to-test-engine-compression

Perform these tests and let me know the results. Also, the 5.0L wasn't offered this year. If it is a V8, it should either be a 4.6L or the 5.4L. So, let me know specifically what engine you have.

Let me know if I can help or if you have other questions.

Take care,
Joe