Sounds like a vaccume leak , check the aux air vavle and the hose connected
to it...
also check your aux air vale wire, make sure power is coming from there..
you can also squeez the hose for it and see if it drops.

-Lee

"Petey" > wrote in message
oups.com...
>I just bought an 85 GTI on saturday. While driving home 80 miles
> whenever I stopped or idled the car the idle speed was at 2000 rpm.
> Yesterday the same thing even at a cold start. This morning when I got
> in the car and drove in stop and go traffic the idle was right at 950
> rpms. The rpms did surge up and down a little but not enough to cause
> alarm. What could cause my idle problem? Is there a vaccume leak?
> Any suggestions are welcome.
>