John,
Did you replace the EZ69 with the MSD system? I believe the engine speed signal originates in the EZ69, but I could be wrong. My schematic is not clear about showing where the tach is wired.
I would check the +12 volts going to the coil when the engine dies. Mine had a wiring problem that caused that voltage to be lost.
Good Luck,
Mark
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1991 964 Polar Silver Metallic Turbo Coupe
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