Hi,
If it loses power under a load, the first thing I would check is fuel pressure. If it is low, that can cause what you experience. Take a look through this link. It explains in general how to test fuel pressure.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Also, let me know if you hear any rattling from under the vehicle. If the insides of the catalytic converter are loose, that can cause a partial restriction of exhaust from the engine. That will cause low power as well. Here is a link that explains common symptoms related to a bad converter:
https://www.2carpros.com/articles/bad-catalytic-converter-symptoms
Let me know if that seems to mirror what you experience. Also, let me know if you have a live data scan tool. If you do, let me know what the short-term fuel trims are.
Take care,
Joe
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Wednesday, August 25th, 2021 AT 9:07 PM