I've adjusted the idle speed screw on my Holley 750 so it idles nicely at 750-800 RPM. I've also adjusted the idle mixture screws; initially to 1.5 turns out, then a very fine adjustment (another 1/8 out) to get best rpm. Since there was a slight hesitation upon acceleration from idle, I've also adjusted the primary accelerator pump so there's hardly any slop, it moves as soon as the throttle is moved. When I coast to a stop after cruising, engine at normal temps, idle stays at 1200, even as I blip it. Then she very slowly goes down to 1000, then to 800. I've fooled with return springs too, hard, soft, long, short, etc. It still does it.
Anything I'm missing? Any suggestions?
