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Unstable Idling: Hunting

  1. Check spark plug for improper gap or fouling.
  2. Ensure there are no vacuum leaks into intake system.
  3. Check EGR Control valve operation.
  4. Ensure engine has adequate compression.
  5. Disconnect exhaust gas sensor and monitor change in driveability. If it improves, replace sensor. If not, go to step 6).
  6. Enter self-diagnostic Mode II and monitor exhaust gas sensor operation.
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