Idle question.....

[Spotted]

Ok, I usually have a really bad idle problem. It usually pulsates between 1000 and 500 RPM. Sometimes stalls out.
I usually run my air all the time.
I mean the temps down here rarely go below 85.
Now, the temps outside are cooler now about 78 and I am not using the air as much.
The idle is now much better. If I put it into neutral, it is even better, staying around 750 RPMs.
Does anyone have any ideas as to what I can do to help the idle with the air on?
I think the problem may be related to the AC.
Any suggestions would help.

Thanks

[93SOHC]

Theres a lot of posts on here about bad idle. The more load on the car the worse the idle. IMO try the grounding idea, thats my next attempt