Q Jets are also known for defective foam floats, they become partially waterlogged with gas. They will hold some pressure at the needle and seat, but will sink prematurely, opening the needle too early.
If the carb sits around for periods of time dry, it will act fine at first, then as the float takes on more fuel it will flood.
Not a common problem, but I have seen it a few times over the years.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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