Engine will not accelerate?

Yep, it sounds like the car is in limp mode, most of the time this will be because of a dirty throttle body, or you have a wastegate or turbo that has come apart. These should leave some kind of code and even if the check engine light is not on, here is a guide so help you run the codes to be sure we are headed in the right direction to fix it.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, this guide can tell you more about limp mode:

https://www.2carpros.com/articles/reduced-power-limp-mode

Here is how to service the throttle body which should be done as a normal service. This guide you can use as general instructions:

https://www.2carpros.com/articles/throttle-actuator-service

Check out the images (below). Let us know how it goes.