To adjust the idle circuit fuel mixture, take a screwdriver and turn the screw on both sides of the carburetor until it slows the engine. Prepare a carburetor for adjusting the air and fuel mixture with help from a specialist in car restoration in this free video on car maintenance and auto repairs. Expert: Gabe Braedt Bio: Gabe Braedt currently works restoring car bodies at a local shop. Filmmaker: stephen kuykendall