Hitting a flat spot

ok, here's what is happening. when the secondaries are opening there is not enough fuel being pulled into the boosters. which means there is not enough vacuum to pull the fuel up out of the bowels into the emulsion tubes and out of the boosters. the cure, slow the open rate down. when the throttle is on the floor or close to it there is zero vacuum signal so no fuel will flow which means the engine is too lean and will not fire or miss fire. so by slowing the opening rate you are giving time for the engine to produce more vacuum to start pulling fuel up and into the boosters. this is just what the one member said, he pulls the engine up slowly and it will pass through the mid rpms ok but will again miss fire at high rpms. he let the motor produce vacuum through the mid range by having the throttle plate partly closed. the high rpm miss fire he has is a lean condition also but is cause by too low fuel bowel level or not enough pump output.