Hey guys. I have a 06 Cobalt SS with 2.4 N/A engine. I recently charged my ac and had a rough idle and acceleration. Turned off ac and car idles and drives fine for most part. When I put it into third gear is when I notice a bog problem (2500-3000) rpm. Its quick and isnt terrible but noticable at same time. Any ideas on what might cause this? Bought car two weeks and ran great but now that I wanted ac a little colder this problem came up. Thank you guys and girls.

AC is not any colder either, in doesnt blow out any cold air now. Just warm.