Check engine light and high revs

I have a 2011 Chevy Aveo LT. 87000 miles.

At the beginning of the month, my check engine light came on. And I noticed that it was revving higher than normal when I pressed the gas. Idling was fine, it stays around 1000 when idling. I didn't have time to get it to a shop for about a week, and then, the light went off. (so I didn't take it in) About a week later, it came on again, for about 4 days, then it went off.

It's not on right now, but I still have revving issues. I will barely press the gas pedal and it revs up to 2500-3000. Once I get going (I do a lot of highway driving), it doesn't rev so high when the gas is pressed, but that's also probably because it's already at 3000 when I've doing my normal interstate driving. I really only notice the high revs when I'm going slow (like in traffic) and trying to increase speed.

Any suggestions? I'd rather not take it to the shop and spend a lot of money to fix it if it might be something simple to take care of.

Thanks!

When the light comes on take it to an autoparts store. They can hook it up to a computer and tell you the code for free. Sounds like a possible bad throttle body to me, but I would definitely get the code read before buying any parts.