Reply to "Hard miss at startup, then smooth running?"

I just put on a brand new Holley Avenger and the same thing was happening right out of the box. Holley even sent me a new choke housing to see if that would fix it. I tried every increment on the choke setting every morning during cold startup and still no luck. I returned it to the local auto parts where I bought it and exchanged it for another one. Still the same thing! I figured it was something else not carb related at that point. Turns out that I had to adjust the idle-mixture set screws on each side of the carb using a vacumm gauge. Now it starts up fine. I did however install a heater sensor on the intake manifold that opens the choke at a slower rate as the engine warms up. The choke would open a little too quick even on the richest setting. (Counterclockwise). This may not have nothing to do with your problem, but you mentioned you put a new carb on. For anyones info, the sensor installed is available from Holley. It's held on by one of the intake bolts, and has a wire that connects to the negative side of the choke.