1995 GMC Vandura 3500 Q&A

1995 GMC Vandura 3500 Question: Starts, idles for a few seconds then quits.

I just replaced the fuel filter, EGR valve, PCV valve, and Engine Coolant Sensor. There is a very loud suction sound coming from carburator (Fuel Injected). Engine starts, idles for a few seconds then quits. What could it be? -
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