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Q: Truck idles fine but, will not stay running while driving on 1991 GMC 1500 Pickup

I have replaced fuel pump, fuel sending unit, rebuilt TBI, replaced injectors and new fuel filter. No check engine light.
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AT WHAT TIME DOES IT DIE? WHEN PUT IN GEAR(AUTO. TRANS) STOPPING AT LIGHT.
RUNNING 40 MPH AND DIES OUT OR WHAT? WHEN IT STALLS WILL IT START RIGHT
BACK UP?
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