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check light went away

I've had a problem that my check engine light conmes on under light load
inmainly third gear. The idle was slightly high, as well. I figured that
the previous owner tinkered with it (he did because the isv was bad and he
tried to do other things on it to make the car idle normally). Anyway, I
went for the idle screw and saw that it was backed out 2.5 turns. I seated
it, the idle came down, check engine never came on again. Interesting.
Also, boost comes on better, and harder. Before, it was very hard to get
in to boost without dropping the gas pedal. Anyway, I can live with 300
fewer rpm's at idle.
Anyway, what engine control system could the screw have been affecting on
boost? I was getting a knock sensor malf. warning.

*Steve                                             Sachelle Babbar
*'87  5000CS Turbo 5spd 1.3-2.0 bar             <SBABBAR@IRIS.NYIT.EDU>
*Cockpit adjustable wastegate, AudiSport badge
*Disclaimer:"Any information contained herein is based purely on my own
*personal experience and may not necessarily reflect yours. Use caution as
*your results may vary from mine."