Adjust fast idle screw as needed. The sometimes get loose and because of excessive clearance will bind causing your problem.
1985 7 5 460 Rough Idle In The Morning Ford Truck
Holley fast idle cam sticking. Holley fast idle hanging up so what your saying is the fast idle arm is still making contact with the fast idle screw when warmed up. Fast idle should be set at 2000 rpm. One of the ways to get a good starting point is simply to loosen up the choke housing screws on the retainer. Slightly crack the throttle open unload the fast idle cam and turn the choke cap clockwise until you see the choke plate open. At that point is the choke plate wide open or not. Polish the connecting parts and use thin washers to take up any extra slack but the cam must still move freely without binding.
Some carbs might allow you to install this rod backwards or upside down. Loosen them up just enough to allow you to rotate the choke cap but not enough to allow it to freewheel. Try giving the carburetor a little gas at the throttle arm and make sure the choke plate is wide open. I tightened it after the high idle issue. I actually just tightened the return spring because it was pretty loose. It might fit together ok but stll not allow for full free travel of the lever cam or linkage rod.
Maybe a spacer or washer missing somewhere. Theres probably a rod that connects the choke valve to the fast idle cam. The fast idle cam should move freely with the engine warm or the linkage un hooked.
Gallery of Holley Fast Idle Cam Sticking
