When I first installed the 750 on my new Edlebrock intake the vaccum secondary linkage was hitting the choke well on the intake and causing a similar issue. I had to clearance the well a little for the linkage to clear and that fixed it. Also, make sure there are no vaccum leaks. Donald Gallimore wrote: > > Did you plug the fitting or tie in the PCV hose on the back of the carb? > I left > that open one time and that happened to me. > > > Akron Don Gallimore > > > > ----- Original Message ---- > > From: William Harrison <bbjt3@xxxxxxxxx> > > To: 1962to1965mopars@xxxxxxxxxx > > Sent: Tue, September 14, 2010 2:37:10 PM > > 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. > > > > > > > > Jeff Adams 64 Polara ---- 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.