Hi! Can anyone point me in the right direction? I have a 74 260Z with 2 round top SUs which really hesitates and begins to die at speeds greater then 50 MPH. The gas pedal just feels very weak and i can feel the whole engine choking itself to death. It even died a couple times on the freeway (scary!) I know that my valves really need an adjustment (they clang/click like crazy), I am working on that now. However, the car feels really strong at low speeds and I honestly have no idea what the problem is.
Also, my gas tank has a small leak which stops once I have less then a half full tank. Every once in a while, everything works PERFECT, and I can go about 90mph with everything workoing fine. Of course, my electric fuel pump is on. The fuel filters look clean. And I have never messed with any carb settings because the car ran good. I am pretty new at this... if anyone has any help I would be gratefull!!!