Quadrajet stumble... Any suggestions??

I just got an '86 Monte Carlo LS with a 305 and Quadrajet. Problem is when
giving it too much throttle (maybe last 1/3 of pedal travel) the engine
falls flat on it's face. Acts like it would if it were not getting enough
accelerator pump shot if you floor from a stop or low speed. Even out on
the
road doing 40-50 MPH it will still stumble and fall flat on it's face.
Holding WOT it will kinda pick up a little and then die a bit and slowly
pick up some more. It will still stumble even if you gradually roll into
the
throttle, slowly giving it more until it stumbles.

I was wondering if those huge secondaries are flopping open too quickly
and
at too low of an RPM and giving an awful lean condition. I've never worked
with a Quadrajet before so I don't know much about them. I've only used
and
rebuild Autolites and Holleys. I've downloaded some very detailed
Quadrajet
service manuals and am thinking I'll pick up a kit and rebuild it. I'm a
little nervous about it as it seems like such a complex carb.

In any case, if anyone has any ideas about that stumble/bog I'd appreciate
it. Thanks.

    Cory