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1976-77 Fox

  1. Ensure that line from EGR valve to front exhaust pipe is not leaking. With engine running at idle, disconnect vacuum hose from EGR valve.
  2. Disconnect vacuum hose from distributor vacuum retard unit and connect hose to EGR valve. If engine speed drops or if engine stalls, EGR valve is operating properly. If not, vacuum line is plugged or EGR valve is defective.
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