1988 s10 not starting

[tk1251k]

Right after adding gas and getting onto interstate up to about 70 mph it just lost most of its power still run but mot much power. Got it off to the side of the busy highway. SO far changed the fuel filter no help. Getting gas runs briefly on idle then cuts off. We got to run about 20 mph to get off the highway by feathering the gas. Had it towed home last evening. Now the fun begins. All hoses seems ok but I need to check closer. Truck ran great up until that point. Has only 34,000 miles on it. Any suggestion tips or help appreciated. Thanks in advance.