With the engine running, I began moving the lever on the vacuum box to the intake pipe just beyond the air filter. This is also the one that is connected to the throttle. Suddenly, idle dropped back to normal, if not then it was only slightly high. In trying to figure out which specific movement caused the change, idle went back up to 1100. I then moved the lever counter clockwise as far as it would go. When it reached that point, idle went back to normal again. It remained as such when I let the lever go. This worked several times. If anyone recalls from my previous thread (linked to above), one of the cars symptoms was that the idle speed would drop to about 400 in park when I turned the ac on. Well, now when I turn the ac on in park, the engine dies. No surging, no chugging at all. If it's on before I start the engine, rpms will dip, but it will catch itself. When I'm driving, if I turn the ac on, there is no significant change. Does anyone have any idea what this could be?