so recently i had to put a new evaporator in the dash to get the air conditioning to work. Anyways the air works great at highway speeds, but driving through town it idles around 5-600 rpms and if im slowing down it kills the motor i know something should kick the idle up when the ac is turned on, how do i diagnose this and fix it, other than when the a/c is on the car runs great no surge or anything...thanks guys