Hi all! I just purchased a 2006 2500 quad cab w/ the 5.9 cummins- the truck has 87000 miles on it. this is the first diesel I have owned. Everything seemed fine until I tried getting on it as I was pulling a slight hill- trying to accelerate from 50 to 65 mph. The engine wound up to 2200 rpm, then I heard what sounded like a sudden release of air pressure, and the rpms dropped back down. This happened several times in a row- now the check engine light is on and I have little power what-so-ever. I was hoping someone could point me in the right direction for the cause of the problem. Thank you!