MAP SENSOR VACUUM

I have a 1986 Mustang GT all stock, there is a white tee coming from the MAP SENSOR, do anybody know where the vacuum line connect. If I plug it the car will stall, with this off the car runs very rich.
 

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MAP sensor = Manifold Absolute Pressure = Speed density
BAP sensor = Barometric Absolute Pressure = Mass air

86-88 Cars read manifold pressure to adjust fuel/timing, while the mass air cars use the Mass air meter to directly sample it and use the BAP to reference atmospheric pressure to calculate density.

If the OP's car is still speed density, that port needed to be capped. Should be a direct line run from engine manifold to the sensor. If the car's been converted to mass air, you'll need to remove the line from the sensor and cap the vacuum line to the engine.

I bet there's other issues going on as well
 
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