HOLLEY 770 wont idle down.

340 engine with a 770 street avenger wants to run about 2000 rpm. It worked great till today, I eliminated the throttle cable, I backed off adjustment, I even turned fast idle screw out to take everything out of the picture. You can manually grab linkage and force it to slow idle but as soon as you let go it revs back up. I sprayed everything with wd40. It seams to have a bind on it but I cant figure out where, any sugestions or anyone else with this issue?