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running rich on a Holley won't be caused by the linkage. There are idle screws on either side of the primary fuel bowl (closest to the firewall) which primarly control idle mixtue. 90 % of all holley's are leaned out by screwing the idle mixture screws in.
What you do to one you should do to all 4 screws. If the idle mixture doesn't change when you a adjust the screws in your fast idle settings are wrong. In cases like that you are running rich by actually idling with the low speed idle transfer slots partially exposed.
The best place to begin is by ting t lean it out by using the idle mixtue screws. Let us know if that works.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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