If you have that idle adjuster screw all the way in then you have either an air leak or the ISC is not functioning. You can hear the ISC clicking when you turn the A/C on and off, it should do a little clicking, but that still won't guarantee that it is working. If the computer senses that the car is always cold then it will keep the idle up too, there is a sensor for that too. Still sounds like a vacuum leak though. Make sure that the screw you were playing with seats in all the way too. Sometimes all the carbon build up won't allow it to seat when screwed in all the way. Also, if all else has been checked, the brake booster could be leaking air. Just pinch off the hose to it to check that one out.
Keep trying!
Russ
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