Ok I have an 06 cobalt S/C so I went to go clean the TB because it's dirty so I unplugged it an unbolted it to clean it let it dry and but it back after that my car idles from 1200-1800 rpms but when I'm under 10mph it idles normal it's already been like for a month an a half still same problem so I took it to the dealer and it gave me these codes P1516, P2135, P0507, P1682, P0201-04 they told me that I needed a new PCM

 

probably just need to replace the throttle body now if you sprayed cleaner in it

 

Have you cleaned the plugs to the pcm and reconnected them? I'd try that before buying a new one.

 

Where is the PCM located

 

If it's the same as the TC, the to the right side of the engine.