Take mixture screw all the way out and and use air hose to blow out the passage. This wiil probably cure your problem as the idle passage is stopped up if it will not affect the idle speed.
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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