Hi Doug,

I used to have that same problem when I was running a 2.1 WBX.  Turned out
to be a vacuum leak.  Check all your hoses on the topside of the engine and
look for old, worn, cracked segments, especially at the ends.  I simply
changed all my vacuum lines on and about the engine and the problem went
away.  That being said, however, there are other gremlins that can cause
your problem as well.  Good luck.

Warren

>>Anybody have any tips on where to start looking for reason for unstable =
idle?

88 2.1L idles 900 then speeds up to 1900 slowly then back to 900 and so =
forth.

idea?

Doug<<