Backfires

Okay it sounds like the car is in limp mode because of the check engine light.

Here is a guide to show you how to get the codes so we can go from there:

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

Autozone will run the codes for free by the way.

Here is a guide on engine backfires:

https://www.2carpros.com/articles/engine-backfires-while-running

Please let us know what happens.

Cheers, Ken