The last week or so, my truck has a rough time starting every once in a while. It cranks like crazy but it will chug and sputter then die. It wants to run but it feels like my fuel pump may be going bad. If this was the case, wouldn't I have this problem every time? It does it more when I'm in and out a lot. Or could I have a bad sensor? I bought the truck used with 185,000. It's a 2002. I'm pretty sure the fuel pump is original. Thanks