Sam,

I'd recommend you follow the idle troubleshooting sequence in the Bentley
manual, but if I had to guess I'd suggest the problem could be your
throttle switch. Easy to check for continuity with the throttle at idle, or
if you don't have a meter, put a jumper across the plug downstream of the
throttle switch with the engine idling fast, and see if the speed drops.

Angus

>I've read numerous notes that deal with idle problems with the 2.1L
>engine. My idle problem is interesting but different from many of the
>others. When I start the engine on cold days the idle is about 1100 rpm
>and is smooth and quiet.  However as the engine warms up, in about five
>minutes the idle increases to almost 2000 rpm where it stays, also...

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Angus Gordon
'86 Syncro
Delta, Ohio