isx black smoke, fuel knock, engine year 2009 running rough

[woodwoody1]

at my wits end, appears to be air in fuel system,air in return is this normal?already listed symtoms in subject.all preasures good, did injector test 2 leakers with air bubbles . replaced no improvement please help.also replaced fuel and timing actuators. once its at temperature it will also start blowing blue smoke like it is regening but 2-3 times as bad and hot pipe light is on. I got pulled over trying to get home but the ranger let me go because I told him it was regening and he looked to see if light was on but you can smell the excess fuel. thank for any help