[Rick Parker]

These symtoms are usually caused by a couple of things:

#1. Fuel is sloshing forward from the rear bowl during braking and dumping into the auxilary venturi in the center of each throttle bore. (There is usually a small stamped metal screen installed on the metering block over the bowl vent hole).This sudden surge of fuel happens when the secondaries are closed and dramatically upsets the air fuel ratio causing a temporary rich condition. Just install the plastic "whistle" and adjust the float level. Parts are cheap and work wonders.


#2. Fuel is being forced to the front of the forward (primary)
bowl during heavy braking uncovering the main jets causing a lean condition (no fuel). This condition would normally only happen if the float level was low on the primary bowl combined with questionable fuel delivery.

I experienced this and even went so far as to add the "Jet Extensions" (drag race stuff) to the both primary and secondary main jets.

.........Rick