I have a freshly rebuilt motor. If you try to start just in neutral with engine warm or cold it will barely hit. With a pump of the throttle in neutral it will crank everytime with it throttled up slightly. When you start to idle down it will surge some and you will hear sucking and then stall out unless you pump the throttle to catch it back up. I have a inline fuel filter but no water seperator which I need to get I know. I just went through the entire carb and dipped it all. I found settings for the idle and mixture screw which is 2 and 9 1/2. The timing is on 0 degress. It has new factory plugs, but I didnt replace condenser thats mounted on side of distributer. Other than idle it runs great smooth no surge or anything. Ideas?