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Holley 4000 Idle Circuit4000 Parts


Rough Idle?

  • Adjust the idle mixture screws.
  • Check the idle mixture screws for damage. Any grooves or bending in the tip indicates a replacement is necessary.
  • Look for loose or damaged idle tubes.
  • Clogged or restricted idle circuit passages, or air bleeds.
  • Carbon deposits in throttle bore - rebuild carburetor.
  • Idle rough only when hot. - Check vent tubes to be sure they are not clogged.

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