Audi 5000 idle problems

[Zsolt]

While we're on the topic, my car tends to rev high when it's cold
outside, especially after it was pushed a bit. I never really checked
why it was doing it, but it never did fluctuate like that.

What could that be? It's an 88 5ktq.

Thanks,
 Zsolt

Tom Christiansen wrote:

> John,
>
>>  The car had a rock solid 800 rpm idle. Suddenly while driving idle
>> would not decrease below
>>  1200 rpm. Would climb to 1400 rpm then drop again to 1200. Frequency
>> was about one cycle
>>  per second.
>
>
> Mine had similar symptoms. It did indeed turn out to be the ISV. Thanks a
> bunch for your response!!
>
> Thanks,
>
>         Tom
>
>