Fuel delivery

Hi:

Have you checked fuel pump pressure? Have you checked for engine vacuum leaks?

Here are two links that explain how it is done. I need you to check this first. Also, I need to know if you have a 2.8L V6 or a 4.3L V6. That makes a big difference for how I direct you.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

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

I mention fuel pressure based on your description. If the pressure is too high or low, it can cause this. Also, a plugged catalytic converter can also cause it. If you suspect the exhaust could be plugged, here is a link explaining how to test a catalytic converter and another that describes common symptoms associated with a bad converter:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Let me know what you find or if you have other questions.

Take care,
Joe

Since this is not a carburetor vehicle I don't think it is actually flooding out. I suspect it is more likely not enriching the fuel when you accelerate. This is typical of the throttle position sensor. It could be a MAP sensor but I would start with the TPS because your issue occurs when pressing the accelerator. Granted the PCM is looking for manifold pressure change and throttle input so if it is missing one or the other, it will not supply the fuel and the engine will stall due to a lean condition.

Take a look at this info and let me know what you think. One way to test this is to accelerate and spray a little starter fluid in it and see if it keeps running or even smooths out. The next this we need to look for is vacuum leaks. Let's start here and go to that next.