Lots of good ideas being put forth on this.

When my 2.1L was acting this way - it was the  hose that connects from
the crankcase vent on top of the engine over to the AFM. It looked fine
from the top, but when I reached underneath it was rotted out. A new
hose solved the problem.

Regards,

John Rodgers
88 GL Driver

Doug Noganav wrote:
> 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
>
>
>