It seems like every time I start my 1990 legacy the idle drops down almost so low that it wants to stall but comes back up real fast and the idle is pretty smooth.

Sounds like the idle air control valve sticking. Do you have any other symptoms, or just that?

 

You may want to pull the tube off the intake tube that goes to the idle air control valve and shoot some brake cleaner down there. It'll help get rid of any carbon build ups that may be causing the valve to stick.

Seems like just the idle thing. I will try the brake cleaner.

 

Thanks again.

Interesting, my 2004 WRX does the same exact thing.