97' ranger misfire
I recently installed new plugs and wires on my 4.0l ranger. The check engine light has always been on and I have had it checked before. It always reads too rich or lean in bank one or two. I take it that this is for an o2 sensor. I had it checked again the other week and it read that I am misfiring on 4 out of the 6 cylinders. I figure if that were true that I would be in for an extremely rough ride, but my engine seems great. I am not noticing any misfiring. Also if it were misfiring that bad wouldn't I experience a substantial drop in my gas mileage? I am still at around 16 mpg around town. Any ideas on what the problem may be? Any help would be greatly appreciated. Thank you.