1993 Bonneville security light flashes than engine stalls.

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Happens after car is driven for a while. It restarts after it stalls and runs awhile until it happens again. When it occurs interior lights come on. It happens both when driving or sitting at light. Car needs to be driven for it to happen. When it stalls everything shuts down. meters act erratically , rpm's up and down, battery gauge drops, until complete stall when all shuts down.