Weird Engine issues in 2007 Yaris (video inside)

[kustomrtr]

Hi, my car recently suffered an "accident" when it was set on fire intentionally by a mysterious person. But that's a story for another day. I'm here because I need you to help me out with my car.

When I suddenly step on the gas, the car makes a weird noise and it loses a lot of power. Plus the engine feels like it's got not power at all.

I recorded a video on the issue so you guys can have a better idea of the issue:

https://www.youtube.com/watch?v=5Hay...ature=youtu.be

What could it be?

I tried replacing the air filter assy (it's melted, so it was useless), and added a cone air filter to see if the issue was gone but I didn't have luck.