318 Engine stumble

I went into the carburetor and cleaned out all the jets and bleeds with compressed air and carb cleaner

Readjusted the accelerator pump. It seems to be better

The problem off idle is still there. A huge surge that makes the engine shake. While this is happening. I looked down the carb.

The transfer slots are putting gas in there at the right time. The spray evenly.

The idle vacuum is still 21”

When I floor it. The bog seems to be gone as the accelerator pump seems to be doing its job there.

When I slowly raise the gas. THe accelerator pump does nothing. The transfer slots seem active until the main jets start working.

When the main jets start working the problem seems like it’s gone

I checked the diaphragm in the accelerator pump and the check valve inlet. They are fine.

I sprayed around the base of the carb with cleaner when the problem occurred and no change. I sprayed down into the carb when it occurred and no change.

When driving. I can floor it and the huge flat spot is gone. Now there’s just the surge and when I power through it quickly all the power is there as the main jets take over.

When hitting the throttle fast. The accelerator pump is working

I do have a video of the surge. It’s is off idle until the main jets take over.

The carb jets are 62

The vacuum gauge says 14 when the problem starts