Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Your description leads me to believe that the fuel pump is faulty.
When you add fuel to the throttle body and it runs, this tells me that the engine is not getting fuel from the pump.
The first thing to check is the Fuel Pump Relay, see if you hear a click from under the dash when you turn the key to the on position. This relay is located on the passenger side of the dash board. If you don't hear a click, replace the fuel pump relay.
If the relay works then replace the fuel pump.
Removal & Installation