Vacuum leaks are absolutely the most likely culprit!

If the problem still persists after eliminating any and all air leaks,
check the idle switch on the throttle assembly. I dunno about the later
vans, but on my '85, if the ECU doesn't get the "throttle is closed" signal
from this switch, the engine idles high.

At 11:09 AM 9/30/2004 -0400, Christopher Brooks wrote:
>I have a stock 2.1 watercooled engine that runs well, but consistently
>idles at 2000 rpm. What should it idle at and how do I adjust it? I've
>recently replaced the coil, distributor cap and rotor, plugs, wires, air
>and fuel filters. Is this something I should just leave alone and be
>grateful that my van is running at all?(snip)
>*********************************************
>
>IMHO, First and foremost, I would look for some sort of intake vacuum leak.
>Grab an old w!ndex bottle, and fill it with some soapy water and spray around
>the airbox, manifolds,etc.. and see if you get a drop in the idle.
>
>Unless you or someone else played with some screws in the engine bay, I would
>bet it's an air leak. The air intake boot can crack along the seam on the
>back side, so be sure to check there first;)
>
>C.B.