I have a 2006 f-350 diesel and it has a cold air intake and performance exhuast. I just started experiencing think heavy white smoke coming from the exhuast and no power at low end. When it gets over 2000rpm it cleans up but as soon as it goes below that again it blows that white smoke and its hard to get power up again. Does anyone have any solutions to this. The truck only has 74000 miles on it and doesn't leak any coolant.