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I HAVE A CODE FOR P174 AND P171.

(2004 Ford F-150 Heritage)
in Kayenta, AZ on August 19, 2012
TRUCK RUNS ROUGH AND THE TRUCK SHUTS OFF. SOMETIME IT MISSFIRES AND HAS LOW POWER. ALRIGHT REPLACED THE MAF SENSOR.
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Popular Answer
of Greg's Orange Auto on August 20, 2012
look for vac leak at pcv hose, very common issue other than that it could be several issues
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