My 85 32v idles at about 1500rpm. This just started yesterday. Reading prior posts about the idle stabilizer suggests that if it is at fault the idle fluctuates, mine doesn't, it's always fast. I did have the air cleaner off to adjust fuel pressure. But the idle speed was OK when I put it back and it wasn't fast until about 45 minutes later.
Rick

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make sure the idle switch is working. I believe the car will idle at around 1200 if the idle switch is open circuit (or is it short circuit?). also check for vacuum leaks.
greg
88 S4

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check for any vacuum lines that you may have hit or bumped off.

Darren.