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Since you have checked float levels; sounds like the transition circuits may be fouled. Holley's have "transition slots" to provide fuel flow between leaving the "idle circuit" and getting into the "main circuit". I have found trash blocking one of the transition circuits to cause what you describe.
Good Luck. Dan
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Dan Case
1964 Cobra owner since 1983, Cobra crazy since I saw my first one in the mid 1960s in Huntsville, AL.
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