I have a 1986 Dodge ramcharger with a 318. The truck was not running when I got it. I have replaced timing chain and gears, distrubiter, cap, ignition coil, plugs, wires, rotary button, alternator, battery. I have to spray gas in the carb and it will crank and run. Sounds good until you give it gas. When you put it in gear and give it gas it back fires threw the carb. The number 7 plug gets sut build up on it. Have also tried two different carbs. Will also pop in park while at a high rpm. Does anyone have sugestions on what I can do now.