Check that the idle switch on the throttle body is operational. With engine
turned off, you should hear an audible 'click' when moving the throttle
lever to and from the idle position. If no, you may need to clean the
throttle body and/or switch, the switch must close for the idle stabilizer
valve to operate. Other possibilities are a defective idle stabilizer
control unit (behind the plastic cover at the right rear), or a defective or
dirty idle stabilizer valve. Least likely is a broken wire, but I've seen
all of these causes in different vans.

Karl Mullendore
Westy Ventures
1987 Westfalia Syncro TD 'Otto'
1988 Audi 80 Quattro

----- Original Message -----

> Anyone have an idea why the idle in my '87 syncro has begun to rev up
> and down slightly by itself and as well, when I come to a stop the revs
> hang up into the 1500 range and slowly comes down.  I have been having
> to rev the engine to make it come down to a normal idle.
> Any help would be great!
>
>
>
> Mike Garske