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1974 Models

  1. Warm engine to normal operating temperature and place transmission in Neutral. Connect vacuum gauge and tachometer to engine. Note vacuum reading at idle, increase engine speed to 3000-3500 RPM, and quickly release throttle.
  2. Manifold vacuum should be about 24 in. Hg and then gradually decrease to level noted at idle. Check that set vacuum is 21 in. Hg. If set level is higher (lower) than specified, turn adjusting screw counterclockwise (clockwise) until correct level is reached.
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