Hello, I've read thru these forums many many times to diagnose and repair my vehicles yet this is the first time I've posted. I've recently acquired a 1975 f250 custom and I'm having an issue with stalling on decel, or while braking, or while going downhill. Most times the idle is perfect and then for some reason drops low and barely runs. New in the truck are the cap, rotor, plugs, carb, air filter, belts and battery. The carb is a Holley manufactured for motorcraft and doesn't appear to have an air fuel adjustment at least not in the meter block. Any help/ideas are greatly appreciated!