Trying to get engine to idle properly . I may have found the problem in the IAC wiring harness, but my question is which way do you turn the IA screw to raise the RPM. I've gone both ways with it and there seems to be little response. I've had the IAC harness disconnected while doing so. Would like to know how it is supposed to work?

It's more likely some other cause.  Never once since 1992 have I needed to adjust the idle screw on an EA82 SPFI engine.  It's always been something else.  

 

I haven't either and didn't even know it existed until recently. The manual I'm using suggests setting the idle speed as a starting point after timing is set.  I think it said to do with the IAC disconnected. Anyway I tried turning the screw both ways and it made little difference. Just wondering how the thing works. 

I'll know in the morning if the idle problem is solved as I found no power to the IAC until I messed with the harness connection and then got power. 

Counterclockwise to open the passage bypassing the throttle and raise the rpm.

If it is unresponsive,there is another problem.