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Replace PCV valve with one from dealershp and very carefully inspect vacuum line giong to pcv valve for leaks. If problem is still there clean mass airflow sensor with approved cleaner and check for vacuum leaks in lines and intake gaskets. If problem is still not found monitor fuel pressure, if low replace filter, if still low replace pump. If everything is good up to this point replace mass airflow sensor. Let me know if you have questions, thanks.