Let's start a little simpler, check to make sure you have an accelerator pump shot...
Look down the throttle bores and wing it to WOT (with the engine OFF, of course!!). If there is no fuel spray, or it just dribbles a little, then your accelerator pump is either plugged with crap, or the piston/diaphram is shot.
Quadrajets are prone to shrinking the pump piston seal and not working. Hit the throttle, and ba-ba-ba-ba-pop, extreme lean out and dies.
good luck, and why sell it once it's fixed???