99 f250 - blue/grey smoke. doesn't burn oil or coolant. smells like Raw fuel burns your eyes. Changed all 8 injectors, IDM, valve cover gaskets and under cover harnesses. Checked and rechecked everything. Changed CPS and had a compression test done at the Stealership. The only error i am getting is a p0284 but this truck is smoking like a chimney. Poor mileage like 10 and seems to have a slight miss at idle - 1200 rpm. Any thoughts?