[kountzecobra]

Set the float levels first. The float levels are one of the most important settings on a Holley affecting idle, midrange and high speed calibration. Set them where gas just barely wets the bottom threads of the sight glass. Then set the idle mixture screws. Put a vacuum gauge to read manifold vacuum and set the idle mixture screws for the highest vacuum reading. Then set idle speed. You also might have a vacuum leak, so look around for that too.