I have an original 1972 Chevy Pickup with the Quadrajet 4 barrel carb that I rebuilt today.  On the test drive everything was fine until I kicked in the secondaries.  The engine would not idle down and stayed at around 2000 RPM.  Eventually I got the idle back to normal by stomping on the accelerator several times.  I am not sure if the accelerator pump is sticking or what.  The linkage looks to be fine and no binding.  Any one run into this and can give me a quick remedy?.  

Sounds like the big holes did not close back after you opened them. Work them by hand and see if there is a problem getting fully closed.