Rough idle, loss of power, help?

[peasantgirl]

I have a 2007 Yaris, sorry don't know anything about the engine type, or any other details. Today out of the blue it started idling really rough as soon as I start it, and doesn't want to accelerate. The engine light is on.

It got up to about 20 and then I floored it and it reluctantly got up to around 30 and then I floored it again and it downshifted and finally got to around 40 and then I stopped pushing it cuz I was afraid I was doing damage.

It revs up just fine when it's in neutral.

I googled and also did a search here and got some ideas...

I replaced the ETCS fuse and that didn't help. I'm borrowing a friend's code scanner thingie tonight and will come back here with the results. I'm also looking into cleaning the throttle body (if I can figure out how), and cleaning the MAF (did that successfully on a Buick once so I'm feeling confident about it).

Any other ideas?