Report "I searched online to find a way to eliminate pinging on the 307 olds engine and found a site saying by removing the carb and drilling out the egr ports to remove carbon buildup as well as cleaning the egr valve and tubes, says the computer is very sensitive to egr. Does this sound like a solution or not. Car has 87k original miles, and has a freshly rebuilt carb and accelerator pump and full tune up, plugs, cap, rotor, plug wires, air and fuel filter"