well, seems the K20 3/4 ton i have doesn't like driving fast anymore. after by passing the fuel line to the driver side fuel tank, fixing the front u-joints, and basic stuff ie oil. it'll get up to 30-40mph or so then just cough and quit, it'll die if i push it otherwise it just sputters until i slow down. i had accidentally taken the vacuum line off from the tranny to engine, but have since put it back. bear in mind the fuel tank has not been used in 4-5 yrs and i just bypassed the tank selector valve Replaced fuel filter, got new plugs wires and cap/rotor. waiting on a 6mo old Edelbrock Carb to replace old one.