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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1 answer
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?