Editing Holley accelerator pump (section)
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===Ignition advance=== As mentioned above, correct initial advance plays an important part in a clean transition from idle into the main circuits. So the timing has to be sorted out before carb tuning is attempted, else a problem with the timing can seem as though it is a carb-related issue in general, and an accelerator pump issue in particular. Also, if there is a vacuum advance being used and it is hooked to manifold vacuum, the engine can have a slight to a major hesitation if the engine is overly dependent on the increased timing from the vacuum advance. In some cases the drop in vacuum and subsequent loss of ignition advance at the hit of the throttle can cause the hesitation. This ''shouldn't'' be the case if the initial timing and the torque converter stall is sufficient, and the vacuum advance amount isn't excessive (limited to about 10 degrees of vacuum advance max), but stranger things have happened. More on correctly timing the engine can be seen at '''[http://www.crankshaftcoalition.com/wiki/Hot_rodding_the_HEI_distributor#Ignition_advance Ignition advance]'''
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