Mechanics

ENGINE IDLE ROUGH, SURGING AND MISSING

1997 Ford Explorer

Engine Mechanical problem
1997 Ford Explorer V8 All Wheel Drive Automatic

My explorer is running rough and seems to be missing
and surging under excelleration had the check engine light come on said it needed an O2 sensor was able to change the drivers side upstream sensor but am unable to reach the passenger side
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Fireboss
April 22, 2010.



Which sensor did it identify as bad?



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