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Ignition switch cable on Buick Regal

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2000 Buick Regal 118,000 mi,
When using turn signal, all dash lights started flashing and engine quits. Will not immediately restart, but sometimes can get to restart after 10-15 minutes. Now when restarts, engine running very rough. Have not had repaired yet.

Engine stalls when the turn signals are used. This happened at highway speeds and can be very dangerous. Also, the dash lights flashed on and off. Engine will restart but will stall again when you use the turn signals.