1998 Nissan Pathfinder LE Sport Utility 4-Door 3.3L

1998 Nissan pathfinder 4x4 ,109,000 miles , 5 speed , a/c p/w , just had two new up stream o2 sensors put in , new mass airflow sensor , new purge valve put in , muffler and tail pipe installed , have a problem with power , sometime fullpower on acceleration , sometime lacks power , no check engine light on , needs some work , tired of putting money into it , I think it might be something minor , but not sure , no reserve

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