I am getting very inconsistent power. The truck is seeming to be losing power some days and in it on others. I am also blowing a good bit of black smoke. Looks like its chipped but its not. Checked air filtre and fuel filter and they are good. I think its an air problem not a fuel problem. Is there a waste gate solinoid or anything? Or is my turbo on the way out maybe? Fuel mileage is also all over the place.