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ok so a guy i know has an 01 3500 4x4 dually. the problem is occasionally when you try to get on the speed you press the gas pedal and nothing happens, like if im pulling a horse trailor and im goin 25 and need to get to 35 i floor it and nothing happens, it also happened once going real slow like 5mph and i was pulling a trailor and i needed to go over a small hill to get to the road, it was prolly 4 feeet long total and went up 2 fet and i was flooring it and it wouldnt climb rpms or speed. what could this be? he says the fuel filter has never been replaced. and its an automatic btw. all help is greatly appreciated:thumbsup