Check to see that the secondaries are closed - IIRC there is a small set screw that you can only access from under the carb. Racers used to open the secondaries a bit to help idle with big cams (or maybe it was launch - just don't remember right now). SC -----Original Message----- From: William Harrison [mailto:bbjt3@xxxxxxxxx] Sent: Tuesday, September 14, 2010 2:37 PM To: 1962to1965mopars@xxxxxxxxxx Subject: 750 Holley Does anyone know why a freshly rebuilt 750/3310 Holley would runaway at idle. I followed Don Dulmages instructions to the nth degree but obviously did something wrong. Fired the car up and it immediately started racing. Fast idle is backed off completely and the throttle cable is not holding it open. Any help appreciated. Thanks Bill Harrison 65 Coronet 2 dr post ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.