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Check your rear fuel pump relay. It supplies 12 volts to the rear fuel pump and the heating elements on the bimetallic springs in the cold start warm up regulator and auxiliary air regulator.
If that relay isn't working the car can still run on just the front fuel pump but the heating element on the bimetallic spring in the cold start/warm up part of the control pressure regulator will cool off and control pressure will drop down to where it would be during cold start and the air fuel ratio will be too rich.
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