bac and a/c idle help
 

When the a/c is on the rpms bounce from about 900-1300 or so. I posted earlier and was told to check out the bac. I measured about 13.0-13.2 ohms which is a little high according to the fsm, but didn't seem too bad to me. Then I cleaned out the bac as best I could. The car held a steady idle after I started up the car, but after maybe 30 mins of driving it went back to the bouncing idle.
What's going on?
Is there something I'm forgetting to do?
Can anyone help me out?