[RED92LX50]

I have first hand experience with the idle screw NOT adjusting the idle. When I first had underdrive pulleys and the stock alt, my battery was dying, and lights dimming at stop lights. So I figured I would raise my idle from 600 to about 900 (using the idle screw). It worked like a charm - until I turned the car off! When I turned it back on it idled at 600 - I was not happy.