2006 Cobalt LS 2.2 P0300 rough idle and no acceleration power.

Have you had the recalls done on your car?

I looked it up, I guess there was a fuel injection recall that was supposedly done before I got the car, and my car isn't part of the fuel pump recall, but it has the symptoms but when I brought it in they said I don't need it done?

http://www.motortrend.com/cars/2006/chevrolet/cobalt/recalls/ -- not sure how many of these apply to you.

Again, maybe the fuel pump, but they told me the recall doesn't apply to my car because I'm in Massachusetts.

P0300 and p0426 have one thing in common. Cat converter. Have you checked it?

Your description above rough idle and no acceleration power also sounds possibly like a faulty cat convertor.

I had thought that along the way. I will check it out later on or tomorrow and see what happens. Also not sure if this matters or if it's connected, but everytime I take apart the intake and expose the throttle, the performance improves for a short time afterwards?

Just a thought. Have you cleaned your maf sensor? Also check the wire connections to it.

I replaced it 5 months ago, and cleaned it a few weeks ago, just in case.

Oh ok.