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Check that #5 sparkplug lead with an Ohmmeter or multimeter for end-to-end continuity. Some wire sets have a resistor end at both the distributor and the sparkplug. Compare the total resistance with one of the good leads. In cold weather the CDI-ignition develops enough Voltage to jump accross an open resistor, but above 80 degrees F ambient there will be a miss.
Individual ends can be replaced by 'unscrewing' from the Neoprene wire, and while you are troubleshooting, run the engine at night and look in the engine compartment for 'corona' ... high Voltage leakage from the wires. The Neoprene wire lengths can be replaced, and I recommend AC-Delco SS-550 bulk wire, a high-quality 7 mm Silicone-jacketed wire with a stainless steel core.
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Warren Hall
1973 911S Targa
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