I have a 1998.5 Ram 3500 4x4 with an auto tranny and 4.10's. I have slightly larger tires 235's. I was on a trip and was low on fuel when I stopped at a reputable station and filled up. When I left the gas station and re-entered the highway I reached about 60-65 mph and the engine bogged down. Peddle to the floor no power and slowing down. I lifted my foot and slowly pressed again and regained power to a certain point and then again bogged. I couldn't go faster than 60-65 mph. I usually go about 75-80 no problem. from a stop it has plenty of power and I even hear the turbo whine and feel the power. I thought maybe it was bad fuel so put diesel fuel additive. After a tank full it got better. But just yesturday it happened again. I have read most of the posts but they talk about a slow speed dead peddle. I haven't read any like this. Any thoughts? Thanks in advance.