Hey guys and gals. I am having a problem with idling. The car runs great when accelerating ,but when shifting(4spd) or coming to a stop it wants to stall. It will also run like new sometimes, or like poop sometimes. The fuel tank has been cleaned, pump replaced, filters replaced, carb rebuilt and adjusted/tuned as well. What I have also found is there is a single wire valve on the front of the carb, when I beat on it the car will clear up. I am pretty sure that that is my culprit. So my real problem is locating the valve. Non of the parts stores can find it for me. Thanks in advance