[Michael C Henry]

What I've seen is not enough initial timing results in too much idle screw setting . More initial advance and the engine races at the same carb setting .Then lower the idle by backing out the idle screw. Start by putting a timing lite on the engine. Too much idle opening and you are suppling fuel every time it turns over, the hot engine just keeps light it off , may not be accurate timming, but it keeps running. In 73 ,when Ford realy started with the emmissions, they had an electric dash pot on the carbrueator that held the idle open while running and let the throttle plates close once the ignition was turned off. Once that dash pot came loose and the engine deiseled like crazy.