It`s not a Quadrasuck. Just because you don`t understand it don`t make it junk. No, the secondary`s don`t operate sitting in park. On some they will and this indicates the secondary thottle plates are out of adjustment. Also be aware there is a secondary lock out tang connected to the choke assembly, if the choke`s not fully opened the lock is in place. If your going down the road and kick it and it back fires then it`s too lean which is a easy fix by simply changing the secondary metering rods for richer ones. You don`t have to remove a bowl or get fuel on you to do so, it`s a simple 3 minute process. The other possibility is the secondary air flaps are either out of adjustment or the spring that has adjustable tension is broken, it also could be the fuel pump is not keeping up the demand for enough fuel. Take the time and read up about Quadrajets and how they work. You`ll be surprised at the number of advantages they have and how simple they are. They look complicated but there not, they operate almost the same as any other carb. The Quadrajet is a Air Dam carb which means it gives the engine what it demands and no more. All I use is Quadrajets. After years of fooling with holley`s and there poor quality control as well as many other carbs I went back to Q-jets and when you learn to tune them they are deadly contenders.