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Inconsistent idle in '85 4KQ

In message <Pine.GSO.3.96.971014143639.1291B-100000@lars.acc.stolaf.edu> Sean C Thomasson writes:

> 	I have just recently purchased an '85 4KQ. First, I love it. But,
> it has a few problems. One thing that I'm most concerned with right now is
> the idle speed. When I first start it, the engine will rest at the normal
> 800 rpm. Then suddenly, after about 5 seconds, it will fall to about
> 400-500 and then rev itself up to 1800 rpms. It will do this for about
> 1.5-2 minutes, then stop, resting at 800.

Hook a voltmeter up to the main battery terminals before you start the car.  
Tell us what it says.

(The ISC increases idle for a number of reasons.  One is low battery voltage.)

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club