Hi and thanks for using 2CarPros.
It sounds like the transmission is slipping. First, make sure the fluid is clean and full. Low fluid can cause the pressure in the transmission to drop.
Also, take a look through this link. It discusses transmission issues, one of which is slipping. See if mirrors what you are experiencing.
https://www.2carpros.com/articles/automatic-transmission-problems
When you check the fluid, it should be a pink/reddish color and should be done with the engine at operating temperature, running, and the vehicle in park on a flat surface.
Let me know if anything here helps or if you have other questions.
Take care,
Joe
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Wednesday, November 28th, 2018 AT 2:34 PM