2006 chevy cobalt running rough ?

[shear320]

The message comes up that there is engine power loss it ran fine when I parked it 3 days later it is doing this?

[drevrandfan]

one of your cylinders misfired or shut off. it can be bad take it to your chevy dealer they can run a diagnostic on it to see what it is. another possibility is that you just have a bad sensor. but either way take it to the dealer they can tell u wats goin on.