[99-LS1-SS]

I called GM Performance and they specifically said that their performance motors were built and dyno'd without vacuum advance and were meant to run without vacuum advance. I unhooked it at lunch and it seemed to make my off idle stumble worse.
I honestly don't know if it is going too lean or too rich right off idle. I guess I'll buy a #34 nozzle and a #28 nozzle and see which one helps.

I would still like any input regarding the Holley carb.