I have a 1979 f-250 ranger. I bent a push rod about a month and half ago. It didn't do any damage and i replaced all of the rods. The truck ran great for about a week and then one morning I didn't have any more than half throttle. I have replaced my fuel filter, took the carb off and cleaned it, replaced my stator, coil, and checked all of my wires. It runs great at idle and up to about half throttle. I still drive the truck but I can't get on it at all to get around someone or avoid something in the road in an emergency. Any help would be greatly appreciated. It's a 1979 F-250 with a 400. I've also checked the fuel tanks and the switch to change tanks and that's okay. Thank you.