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98 Expedition...Terrible Idle.

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Old Jul 12, 2019 | 04:14 PM
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Guy Tribo's Avatar
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Default 98 Expedition...Terrible Idle.
Error codes P0171, P0174. I've changed the air filter and cleaned the Mass Airflow Sensor. What next?
 
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Old Jul 12, 2019 | 04:42 PM
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Hayapower's Avatar
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Welcome to the site..

Did you check PCV, EGR for leaks? Any manifold or unmetered leak points as well..
Off idle, runs good?
 
Last edited by Hayapower; Jul 12, 2019 at 04:44 PM.
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