Truck runs fine for about 3 miles then starts to miss, doesn't accelarate, runs really rough. When I check the plugs they are black with carbon, heads were rebuilt completely, new carb, wires, caps, everything. Some say it's the carburator, others is the valves, others the manifold spring. I have no clue. Any suggestions, since I have no specific mechanic, I would like to know atleast what it could be before I take it in for professional help and get raped. My brother and law started it for me and then got deployed. Thanks
