Acts like it is starving for gas?

So, it starts up cold, does it also run fine and has full power when it's cold? Then once the engine runs a bit the power goes away, and it acts like it's starving for fuel? Have you checked the fuel pressure? Should have 55-60 PSI with the key on and engine off. I would check it cold, then run it until it warms up and check it again. It's not common but a worn pump that is starting to wear can start drawing more current as it operates a while and decreases the fuel pressure. If you still see the same pressure in both cases I would then put a scan tool onto it and watch the fuel trims as the engine warms up to see if it's the PCM switching to closed loop that is causing the issue, you could also watch the O2 sensor voltages at the same time.
From the description it sounds like it drops off when it goes into closed loop and full control. That should rule out converter flow as the problem as they won't change flow as they heat up. Think of it as a clogged drain, it's not going to flow more cold water than hot water, clogged is clogged. However, it could be something in the PCM that is heating up.

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

Many times, you can get the pressure tester as a loaner tool. The test port is under the plastic cover with a cap over it.

Hi,

The catalytic converters were my first thought. However, low fuel pressure can cause issues as well.

As far as the converters, do you notice any rattling, odd odors, or strange sounds from the exhaust? Are you comfortable removing the upstream oxygen sensors to see if some of the power returns?

Take a look through this link first:

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

If you feel things in that link mirror what you experience, take a look through this link which explains ways to test the converters:

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

Let me know your thoughts.

Take care,

Joe