I've driven a vehicle previously with catalytic converter problems like NVRDONE. It would drive normal under slow driving, but when you needed power it would rev high into the rpm range but it would be very weak, and have little power. This condition eventually lead to a wrecked engine. The engine was replaced under warranty two times because the technicians failed to diagnose it properly. The vehicle was eventually replaced.
"Sometimes you can tell that a converter is clogged because you don't go any faster when you push the gas pedal. Also, there usually is a noticeable drop in gas mileage associated with a clogged catalytic converter. A partially clogged converter often acts like an engine governor, limiting the actual RPMs to a fast idle. A totally clogged converter causes the engine to quit after a few minutes because of all the increased exhaust back pressure. "
Read up on catalytic converters and see for yourself. This sounds like it might be the problem.
Have a good day y'all.