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the throttle position sensor most likley wont cause black smoke,throttle hesisation or driveability from that.the air flow meter has an adjuster screw under that little alloy plug but it really dosent do much if anything,
try the engine coolant temp sensor,at the driver side front of the intake manifold (two wires)brown plug,if you disconnect it I think it goes full rich thinking the car is in veary cold conditions,(black smoke) if you jump it it goes lean.Ive seen corrosion on the pins cause lots of trouble. also make sure the fuel pressure regulator is connected to vaccum, it goes from the regulator to the back of the plenium housing next to the stepper motor.thats probbly your problem.
 
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