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1977 911S Poor Performance (erratic combustion/firing)

Engine

Vehicle Information: Model: 911S; Year: 1977; Body Type: Coupe; Total Mileage: 170,000;

Why does the engine hesitate and misfire under any load conditions or RPMand stalls (once warmed up) at idle? I have done the following, in theorder listed, one item at a time before proceeding to the next item.Replaced the points/condenser (repaired related wires), replaced sparkplugs, PermaTune, Porsche specified coil, control pressure regulator andPorsche specified injectors. I have adjusted the air/fuel mixture up anddown and increased the system pressure by adding shims to the regulator.)

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