why am i losing power while driving after a short time?

Hello,

There are several reasons why the engine would lose power.

It could be from a plugged air filter, bad spark plugs, clogged fuel filter, weak fuel pump, bad air flow sensor etc.
A dirty throttle body can also cause the engine to have low power. Which can be cleaned:

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

Take a look at this video, it covers the typical reasons of why engine could produce low power:

https://youtu.be/U1RoG3I-Oww

Sometimes with issues such as this the check engine light gets illuminated. Is the check engine light on?
If so, having it scanned for trouble codes can help with the diagnostics.

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

Please let me know if you have any questions.
Thank you.