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

Mike could be right! The Holley Choke should NEVER be FULLY closed. When the engine is cold AND the DISENGAGEMENT of the FAST IDLE CAM(and choke plate)is activated(by pumping the accelerater 2 0r 3 times),The choke blade should close to a MINIMUM gap of 1/8" (.125 Inch). If this is not happenning you must first disengage and then adjust the angle of the choke plate at the choke heat coil housing. Usually A Round Black Plastic cover with "Tick" marks around the circomfurence and secured by 3 screws. Loosen screws and turn housing until you have acheived the 1/8" gap.(This adjustment is made with the Engine OFF and COLD. Make sure you have completely released the "EXCAPEMENT" by actuating the Primary Butterflies). Ofcourse retighten the screws. NOW when you start the engine the gap may open a little, or when the engine is revved, this is normal. The Plate should NEVER be sucked completely closed. As Mike suggested, to much choke (completely shut plate) would account for you troubles, Bad COLD Idle; AND would/Could cause Fauling of your spark plugs. If you have NOT pulled your plugs to check for correct burn mixture, or to just see the condition, you must do it now; or else you will never know if any may be causing a miss. Although, Fauled plugs will NEVER correct themselves just by heating up. This can be your oportunity to install a NEW set of plugs. I use Champions with an Electronic Ignition. Good-Luck with it! Marlin.