[Tom Vaught]

A Holley carb or any carb is not designed to perform well when doing a "gorilla stomp" at IDLE and expect the MASS FLOW thru the engine to have the correct fuel to mix with it.

There is always a time lag with the carb circuits.

The outside air does not even really start to move into the engine and without the air and intake signal to the carb.

Then you have the air restriction thru the air filter, (You are running a air filter, right?).

If you are trying to do this "Test" what purpose does it serve if you have removed the air filter and this car is NOT A DRAG CAR. .............WOT FROM IDLE. Chee-it.

There is a thing called PHYSICS that describes how the air and fuel works in a carb.
The accelerator pumps are there to be able to do transitions from normal cruise to passing speed or
higher rpm launches to ATTEMPT to move the car across the starting line quickly.

You should have left the EFI stuff alone as the engine dying when you do that "test"
and is telling you, it is not going to work.

If you disconnect the secondary throttles and run the carb as a two barrel carb you might get the thing to NOT DIE doing your "TEST" if you put a 50cc pump on the front carb and big squirters on the primary side. But now the carb will drive like chit when on the road doing normal speed vs load transitions.

Tom V.