Son's band just bought a '94 Dodge van, 250. Just driving along--it loses power. He said it goes along fine, then it loses power and the throttle won't respond and it loses enough power to have to pull over. It does it on an intermitant basis. He'll push the accelerator down--nothing--then it'll take off like it's supposed to. (I was just talking to him while he was driving it and he said it's going fine. This is intermitant. They had another Dodge van that did the same thing , but they never figured it out. Any ideas? Maybe a filter in the gas tank?