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Car running on when the key turned off

Fuel System

Vehicle Information: Year: 1979; Engine (Size, Modifications): 930 w/powerflo intake, k27/7200 turbo, Powerhaus long neck intercooler w/popoff valve; Total Mileage: 46,000;

Since I've owned the car it has never shut off immediately when you turn the key. I would describe it as idling down. I know that the ignition stays on for 10 seconds after the key is turned off to clean the plugs. I can hear that. My assumption is that some fuel is leaking by. I've got several other friends w/Turbo's whose cars seem to behave similiarly. I also have a friend with a 79 930 whose car shuts right down. Any clues where I should start looking?

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