[Joe's Garage]

Textbook definition of a bog is that when you stomp on it - standing or rolling - it stumbles, flutters, doesn't get-up-and-go.

With fuel starvation, you stomp on it, it gets up and goes hard, then lays down like you let off the gas. Because the carb is running out of gas.

Lots of good suggestions from Cliff R above. Work your way from back to front methodically and you'll figure it out.

We had a 1973 Formula that did this many moons ago and it was driving me nuts. Rebuilt the carb, new mechanical AC fuel pump, replaced the sock and cleaned the tank, replaced the rubber lines front and rear and double-checked the fuel pressure. Everything was good.

Turned out that there is a 4" rubber hose in the center of the car, between the rear metal line and the front metal line and THAT little chunk had a tiny split and it was sucking air on hard acceleration. Never dripped or smelled of fuel, just let air into the system.

Also verify that your mechanical secondary butterflies (in the carb's base) are opening all the way when the gas pedal is floored and that there is not a lockout on the carb that is sticking. Many qjets have that lockout to keep you from flooring it when the engine is cold. There are two lockout possibilities - one on the butterflies and another on the air flap. We usually disable both of those.

And it's normal to only see the secondary air flaps (on the top) open slightly when you wing the throttle wide open. They react to the need to airflow and sitting still, the engine doesn't need very much.

You mention that you don't hear the 'roar' of the secondaries when you floor it? No roar at all, or is it muffled but still there, just not as loud as you think is should be? The later TAs had that plate blocking the scoop specifically because of the roar we all love. There were noise restrictions and it couldn't be too loud, so Pontiac closed off the scoops starting in 1973. Thankfully, most of those block-off plates have magically been removed.....

Good luck!