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Erractic Idle, engine stalls on 2003 Ford Expedition

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Once the car is warmed up the idle becomes erractic and engine stalls. We already changed the IAC and the Mass airflow sensor but the vehicle idle is still the same
(1) Answer
there is a vaccuum hose that has a 90 degree bend on the pcv hose at the intake. common failure. check and see if it is leaking. you can get just the elbow from ford.

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