I replaced my distributor a bit ago, and finally properly set my timing a couple days ago. When I set my timing and idle, it was done at operating temp, vac advance pulled and plugged and I leaned my airfuel mixture a bit, because it was rich. After set, while driving, when I come to a stop my idle is high. If I lift my pedal with my foot it will lower to where I set it. I looked at my throttle linkage on the carb and after letting the gas out, the throttle doesnt come back and rest on the idle screw anymore. When I lift the pedal it rotates the throttle backwards and makes the idle set screw rest on the linkage how it should. Any recommendations on a fix?