I have a 2003 Explorer. It suddenly started running real rough - like a couple spark plugs were out. I checked the wires to see if one had come off - not so easy! Went to Auto Zone and they checked the codes - sparks plugs misfiring and possible crankshaft position sensor. I changed all six plugs and then the sensor as well. Still runs the same. Any ideas?
I realized after I changed the sensor that I had not disconnected the battery before doing so - would this have killed the new one?
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