Most likely an adaptive strategy problem. I recommend that you clean the throttle body and IAC and then reset the processor by removing fuses 4 & 11 for at least five minutes. Follow up by driving mildly for about 5 minutes. Start with a well warmed up engine.
If you wish to do a more thorough resteing of the adaptive strategy, When you start the engine after dumping the memory by pulling the fuses have the A/C off and hold the idle at about 2000 RPM for about 30 seconds, normal idle for 30 seconds, turn on A/C and hold idle at about 2000 RPM for about 30 seconds, then idle for about 30 seconds followed by mild driving for about 5 minutes.
Basically your computer has learned some bad habits and you need to dump that memory and start it toward better new habits.
