I need a little ford expertise. I have a 77 f-150 with a 302. Just recently the truck has been shutting off while at redlights. It will start again, but not real easy. Through routine maintance and tring to solve this, I have replaced the plugs, cap, rotor, fuel filter, fuel pump, brain box, plug wires, coil. It really seems electrical in nature. No chugging, just shuts off, and not at higher rpms. Could this possibly be a fusable link going bad or a bad ground somewhere?