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I have a 1973 Corvette. Yesterday On speed between 60 to 70 mph, I have fuel flow interruption which makes my Corvette going forward & slowing down continually. Just like hitting the gas pedal & releasing continually. Why is happening with my Corvette? It happened once before, and then my car was back to normal running smooth. The problem is back again.
GRipp 73. It is only when I start driving at the beginning, which always happen and at speed through. That reduces speed, just like it is getting weak.
You say only at the beginning. Are you allowing enough time for the engine to warm up and the choke to fully open? Is the engine stock and the carburetor is a Quadrajet?