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Car searchs fro an idle, black smoke, big hesitation

Engine

Vehicle Information: Model: 911 Carrera; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 90k;

10% of the time it does:Searchs for an idle, will go up and down and finally stall. Weather doesn't seem to matter.When it drives, it will hesitate and make the car stumble big time; throws you forward in your seat.Black smoke is seem out the back when it stumbles; like it is running too rich.90% of the time the car runs great and fast!!Has a KN cone air filter.NEW plugs,wires,cap,rotor and fuel filter, 500 miles ago.Stock ChipI've replaced the MAFS, but still does it.

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