I have a 1970 Elco 350ci, 4bbl, auto. Can anyone help? My Elco stalls one out of every five stops. Replaced: fuel filter, fuel pump, rebuilt Carb.(stalled with the old one also), air filter, plugs, rotor, wires, cap, new pointless distributor, coil, checked vacuum lines for leaks, timing. I'm at my wits end!