Edelbrock Secondaries Lock

First off I am not a edelbrock expert, but I've worked and rebuilt a lot of carbs in my day, so I will take in generalities. IF the choke is not fully open, the secondaries are locked out. Once the choke is fully open, then depending on the design of the carb, there is usually a lever or pin that touches the secondaries throttle lever from the primary throttle rod lever, this helps finish closing the vacuum secondaries when you release the throttle, if the engine is not running the vacuum secondaries will close all the way if you operate the throttles manually, it the engine was running like when you are driving and you let off the gas the engine would run fast around 1500-2000rpm or more, if it was missing or broken. I do this to check the integrity of the secondary diaphragm and the path the vacuum takes for it, and if it is possible to get my finger on the secondary pick-up tube (this is the tube in the venturi that leads to the secondary diaphragm), with the engine off, I open the throttle and hold, then I open the secondaries and hold, then I plug the tube in the venturi, and let go of the secondary throttle and see if it holds vacuum, if it does the secondaries will stay mostly open, if there is a leak, it will close. The hesitation, can be caused by several things, (like float levels, power valve leaking, secondary metering jets getting plugged at little) and the accelerator pump settings or the accelerator pump is getting worn out. Good Luck.