Idle speed adjusment screw woes on the 82 4ks

[nicksimc]

I have noticed  that the idle speedadjusment screw on the CIS injection system 
seems extremely loose.  I noticed that idle was dropping really low at the end 
of a 
semi-regular 40 mile commute.  I adjusted the screw (which felt loose), and 
drove back.  Lo and behold, it dropped again.  I re-adjusted the screw and  
made a 
witness mark.  I have driven it under a variety of conditions since then (to 
the store, 40-mile commute, winding roads, etc),  and when the idle has 
dropped, the 
screw has quite visible turned.  When adjusted back to the mark, everything is 
fine again. It seems to happens under wide open throttle conditions and after 
longer drives.

My questions are:

Is this a problem with the screw, or is it in the throttle body?

If it is the screw, can it be replaced without taking off the throttle?

If I have to take off a lot of the injection system, I'll probably just end up 
pulling a CIS-E system somewhere and upgrading that now.

Any info or BTDTs would be helpful.

Thanks in advance

M Nicksic

82