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I am having a problem with my truck and I am not able to pin point the problem. I mainly see a problem on the interstate. I will be traveling at 65 mph and have to idle down due to traffic. Once I let my rpms get below about 1500 (and 50 or so mph) I have problems re-accelerating. I have no power and it takes a while to get back up to around 60 mph and I leave a big cloud of black smoke. Then all of a sudden there is a jump in power (above this speed) and everything is back to normal for a while. I have no problem slowing from a high speed to a stop and taking off, just re-accelerating at higher speeds. I changed my fuel filters, but am still experiencing the problem. It has happend once at a lower speed, but is most evident at higher rpms. Any ideas????