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

 

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dennissaved7, 5.7L V8, Fruitland Park, FL, February 12, 2011, 16:09
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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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