Quadrajet Fast Idle Problems

[landy]

I've got a 4-barrell q-jet with factory non-electric choke setup. With the onset of cold temps, the choke system doesn't seem to be working correctly. On cold startup, it starts fine and the idle speed kicks up. However, the fast idle won't kick down when the engine reaches operating temp. I can manually move the lever on the psgr side of the carb to get it to the correct idle speed, but when the throttle is moved, it kicks back up. Eventually, after a 1/2 hr or so of futzing around, it will idle at normal speed.

On a related issue, by manually moving the rod that's connected to the choke thermal coil on the psgr side of the carb, the choke butterfly opens fully. If left on it's own, it'll open almost fully, but not all the way. I don't see an obvious adjustment for this. Maybe it's in the steel box housing that contains the coil?

Lastly, the vacuum valve on the thermostatic air cleaner doesn't function correctly. The damper valve doesn't move with vacuum applied to it. Can this unit be replaced?

Thanks!