2004 Ford F-150 Heritage Q&A

2004 Ford F-150 Heritage Question: I HAVE A CODE FOR P174 AND P171.

TRUCK RUNS ROUGH AND THE TRUCK SHUTS OFF. SOMETIME IT MISSFIRES AND HAS LOW POWER. ALRIGHT REPLACED THE MAF SENSOR. -
Answer 1
look for vac leak at pcv hose, very common issue other than that it could be several issues -
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got truck checked out,replaced pcv hose passenger side, 3 weeks later throws codes again,any suggestions?