864q

I need to adjust the idle speed on my 80 4cyl model and don't see an idle mix/control screw like on most other CIS engines. Can anyone tell me how to adjust the idle on this engine? The last mechanic that worked on it adjusted the idle because of a vacuum leak problem, which I have since fixed(no help to him) and now it idles right about 700rpm and should really be in the 900 range. I know the motronic computer does most of the idle adjustment on these, but there has to be another way to fine tune it somewhat. Thanks in advance.

Steve