Double Aught

iTrader: (5)

2001 LS1 as described in my sig. Has done this one other time almost a year ago. Going to p/u my Tahoe, full tank of gas, tried to accelerate and engine bogged, no power. As soon as the clutch went in, engine died and wouldn't restart after many attempts. Every time pedal was depressed, engine died. Let it sit for a half an hour, fired right up and drove back home without issues. My first amateur guess-fuel delivery issues. Walbro pump installed at time of engine build. Not run dry. Any guesses as to what would cause a very infrequent problem?