Thread: bogging under load sounds real bad

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Power rods that are in the carb could be stuck in the "down" position, restricting fuel through the jets.
This is not an uncommon problem with todays gas and the quadrajet.
The garbage left behind from today's fuel creats a build up around the piston and it can hang up in the bottom of the bore therefore not lifting up to supply the fuel through the jet as needed.
Vacuum controls the sliding up and down motion when things are right. But if it's stuck in the bore, it will do exactly as you described.
If this is your problem, disassembly, a good soaking, along with attention to the power piston will cure it.

Right on Nitro -

A good rebuild kit may cure your woes. Soaking in a good solvent designed for removing all the yuckies is a must. Not knowing if you're familiar with the Q-jet entrails, here's a couple sketches. Sorry about the quality, but they're copies. I've highlighted the metering rods that nitro referenced with red clouds - they are in pairs (even though shown as a single in the first sketch).

Probably goes without saying - please wear your safety glasses when using the carb cleaner. It can be real hard on the eyes [don't ask..].

Good luck on this
Glenn