I've had different (limited) experiences with Holley's. On my Landcruiser straight 6 had a 390 vacuum secondary electric choke never had to do anything to it, just ran great. On daughters Elco, hopped up 350 always messing with the floats/idle. I think a lot of it with that was we weren't using non-ethanol fuel, just high octane, once we figured that out it was much better, weird thing was she never ran ethanol free in New Orleans