What are the symptoms of a failed fuel pressure regulator on a 1988 Mercury Cougar with a 3.8L MPI (multi port injection) V6 engine?

What are the symptoms of a failed fuel pressure regulator on a 1988 Mercury Cougar with a 3.8L MPI (multi port injection) V6 engine?
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Okay I’m shooting from the hip; car runs rough, stalls when coming to a stop, tailpipe is blackened and dark smoke comes out, oil smells like gasoline and gas mileage has dropped.
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