My car starts but before I can put it in gear it shuts off.

Electrical issue

SOME FUEL PUMP CURCUITS HAVE INLINE RESISTORS THAT GO BAD CAUSING THE CAR TO START BUT INSTANTLY SHUT DOWN BC THERE IS ONLY THE 2,4 SEC WINK FOR PRIME FUEL PUMP BUT WHEN STARTED PUMP NEEDS CONSTANT VOLTAGE TO KEEP UP WITH DEMAND AND IF RESISTOR IS BAD THE SIGNAL WILL NOT TELL THE PUMP THAT CAR HAS STARTED AND ECM WILL CONTROL VOLTAGE FOR FUEL PUMPS DELIVERY TO MOTOR.. I WOULD DEF... GET SCHAMATIC TO FIND RESISTOR IF APPLICATION REQUIRES RESISTER IT WILL BE NOTED ON SCHAMATIC THAT IS THE ONLY THING I HAVE SEEN CAUSE THE PROBLEMS YOU HAVE DESCRIBED AFTER FUEL PUMP REPLACEMENT BESIDES A SHORT IN CURCIUT GOOD LUCK