Join Date: Sep 2000
Location: Washington, Michigan USA
When you turn your idle mixture screws "in" (clockwise), you're making it leaner, not richer. You can use the rpm method instead of a vacuum gauge, but the vacuum gauge is more accurate, as it shows variation better. When you get highest steady vacuum, only turn them in (clockwise-lean) about 1/8th of a turn ("lean roll" method). If you turn them in a full turn, you're ten miles off, way too lean, and if it runs at all, you'll have to jack the idle speed screw WAY up just to maintain idle speed, which will start dumping fuel from the transfer slot and your idle will be unstable and WAY rich.
'69 Z28 Fathom Green