Hello, After recently replacing my Torker manifold with a Performer, I decided to replaced my Holley 600 single pump with a 750 double pumper. I've had the 750 on the shelf for a few years, it's not new. Problem is that I can't set the idle low enough. With the screw backed out fully, it still 'races' at about 1100RPM in Park. I then did some air/fuel mixture adjustments...basically started lean, then richened until more 'richning' no longer raised idle, then backed it down a hair, but still too high on the idle. Timing is set about 10 degrees BTC, dwell is dead nuts on 30. What should I do from here?