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Vacuum Modulator

  1. Check vacuum modulator filters for contamination or damage. Using compressed air, clean filters. Disconnect vacuum hoses from top 2 ports of vacuum modulator. Plug one port and blow through the other. Air should escape freely from filter on top of modulator.
  2. Start engine and run at 3000 RPM. Repeat blowing test. There should be strong resistance to air flow through modulator. If not, replace it.
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