Reply to "Stumble off of idle - Seeking advice"

Steve - when I installed my QuickFuel 600 last year, out of the box it had a stumble off idle.  I followed all the QF (owned by Holley) videos and everything I could read on tuning it.   Two things solve my issue:  1 - adjust the accelerator pump linkage to zero or a couple thousands of interference.  Do NOT preload the pump by adjusting the linkage too far.  2 - buy a set of new pump cams (get a set of Holley cams that come in all the colors) and look and the graphs online of how each cam changes the shot and duration.  A guy on the GT40s forum gave me this advice and I only had to step up one cam each on my primary and secondary (I have a double pumper car).   Once I did that and dialed in the idle screw settings to maximize the amount of vacuum I was pulling, the car is like butter.   Starts right up and at cold, has complete throttle response.   For street driving, you should not have to drill anything out.   I started going down the path of getting bigger nozzles and was warned to stay away from that.   Hope this helps.