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Procedure:

  1. If Cat is plugged, replace it.
  2. Turn fuel pressure all the way down. The truck should barely be running, with 0 psi.
  3. Make sure the engine is really hot before the test, the cat works
    best like this.
  4. Try and keep the idle at 1100-1200 RPM, if you can sit in it and keep it up.
  5. With all of these everyone should be able to pass.
 
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