High idling 86 5kt

[Leah Mueller <muellerl@cadvision.com>]

After having a new timing belt, steering pump, and an old hose replaced that
was leaking vacuum, our 86 5000 CD turbo with a five speed, is idling now
around 1500 rpm rather than 1100.  Turning the idle adjustment only
increases the rpms, the screw is as low as it can go in the opposite direction. 
Is this part of the idle stablization system or do I need an mixture
adjustment or did the timing get advanced somehow?  I had my mechanic do the
timing belt.

Thanks,

David G. Mueller