Smooth idle but stumbles acceleration?

[DevilzMafia]

I'm running a Yaris 2007 sedan. It's been running great ever since I've bought it. This just happened randomly today that the car would idle fine, no knocking or any of that sort, but as soon as I press the accelerator (even on neutral), the car stumbles, starts turning off, etc it's like its being chocked and the RPM barely goes above 2-3K when flooring it.

So far what I've checked is that it isn't the ignition coils, or the plugs, or even the MAF. I'm not sure if there's any other fuel sensor that I should check in this ride that would be the problem?

Any help would be appreciated guys, thanks!

Edit: Forgot to mention that the engine check light is also illuminated, well obviously.