It has to be the pump. or one of the pumps if you have 2. Esp.if it still has the factory pumps. My '91 would go dead only at idle when it first started getting weak. (at about 70k)Mine does NOT have a pump on the frame rail. Both are inside the tanks. I'm curious about which models had a high pressure pump on the frame rail. An engineer at Walbro Engine Management , who makes the pump/module, told me that if you've run out of gas recently and kept on trying to make it run on "fumes", this will ruin a pump because gas running thru the little motor is what keeps it from overheating. As a previous poster said, have the fuel pressure checked. Doesn't take very long and won't cost much. Fuel pressure MUST be within range.