Sounds like a vacuum leak. Check the rubber tubes between the intake
runners and the intake manifold. Spray a nonflammable carb cleaner on an
area while the engine is acting up and listen for the RPMs to change.
Good Luck & Drive Safely
Ken Lewis
Kernersville NC <Heart of the Triad>
86 VW Transporter Three Door Pickup (168K)
60 Porsche T5 Coupe

On Thu, 7 Aug 1997 13:51:03 -0500 lcarter@cowichan.com (Larry Carter)
writes:
>Hello;  Recently my 87 GL has taken on another character trait.  after
>running enough to get the temperature up, the idle stays at 2000 rpm.
>Sometimes (about 1 in 10) it will drop back to 1000. Another (possibly
>related) symptom is when de-cellerating the van will hiccup, similar 
>to
>running out of gas sensation.  I checked the engine compartment for 
>obvious
>problems, nothing, everything is tight with nothing dis-connected.  
>Oh, I
>recently had the engine compartment pressure washed, and these 
>symptoms
>started after that.  What is the problem?  Where should I start?
>TIA  Larry Carter
>
>