But yes if you screw even one of the idle mixtures screws in all the way the engine should die if everything else is right. IE no vacuum leaks and the throttle blades arent open past the idle circuit slots. You got a factory service manual? It explains how to set the idle screw on a fresh rebuilt carb and the procedures would be the same for the Eddy as the stock Carter. That way you know your not to far open to be getting were your running on the main circuit versus the idle circuit. Now depending on the year the idle mixture screw system could be alot different. Like for instance a 69 AVS idle mixture setup is not going to be apples to apples but a FSM for lets says a 1967 AFB on a 440 would be.