In a message dated 97-11-25 17:45:52 EST, jmatchet@IU.NET writes:

<< my 90 vanagon now has a high idle ~1600-1700 rpm  only in park.  Its
 much lower  1000-1100 while in gear.
 What could be the problem...idle screw adjust ??   what are the normal
 specs?

 tia  john >>

It would be quite unlikely that the idle adjust screw would be the culpret.
 More likely the Idle Stabilizer Control Valve - a cylindrical shaped thing
with both hosed and wires attached to it, which sits roughly at the top
canter of the engine.  Or (if that's not the problem)... the Idle Stabilizer
Control Module  - a black cube shaped (like a relay) electronic device which
can be accessed by removing the right taillight.

Good Luck,
Jim Davis