Yesterday I swapped the cam in the coupe. It fired right up and was running fine while I set the idle, adjusted the timing, tuned the idle mixture, etc. I went back to check the timing and it abruptly died while I was shooting the light. Not a "fuel system went bad" putter but a quick. electrical style kill. I have the original style Pertronix Flame Thrower distributor and their 1.5 ohm coil. There is no spark to the plugs; the timing light won't blink and there's no spark when pulling a wire and holding it near ground. I started chasing down the whole electrical circuit. All of my checks and tests were good. 12.70 V across the battery posts 12.70 V at the solenoid. 11.99 V at the coil using a jumper from coil neg to ground (Pertronix spec is 8.0 V min) .4 ohms from batt neg to distributor base plate (within Pertronix specs - .2 ohms from leads and .2 ohms from circuit) so no ground issue Ignition module test passed: multimeter reading alternated between 12.63 on each magnetic sleeve peak and 0.09-.11 V (theoretically should be 0) on the flat as I rotated the engine. Air gap between sleeve and sensor at nominal .030" All wire ends free of corrosion and tight. The ignition system has less than 2000 miles on it; plug wires are are in good shape and the rotor and cap do not have any obvious wear, corrosion or cracks. Is it possible to get a "pass" on the ignition module test on a bad module?