Check engine light on runs very rough low power

1- Only rough when running
2- Is idle running OK, no problem?
3- How long since the turn up?
4- What kind of Gas filled in? Premium from Shell, from Chevron or from Costco?

The more gathering facts, the more accurate a solution can be provided.

If you say yes to question 1 and 2 then your problem is the O2 sensor.
The rest of the questions to remind you that what need to be done to prevent a potential problem. Cheers.

Sounds like you have a misfire. have plugs wires and coil packs changed.. its common around now with those cars. if your doing it yourself take it to your local auto sotore that performs free diagnostic services. Identify which cylinders are misfirirng and replace the parts accordingly, for assurance replace them all and you know you have completely eliminated the problem