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O2 Sensor

Well with all the recent postings about O2 sensors, now I'm wondering if I
should dig around and replace mine.  It's an ' 86 4KCSQ and has over 100,000
miles I'm sure even though the odometer says 54,000 something.  I don't know
if the previous owners replaced and sometimes the car idles rough.  Although
now I'm wondering if I have a vacuum leak somewhere, and if I did where it
would be.  Should I replace the sensor just to be safe?  It seems like the
car should get better gas mileage than it does, but then that could be the
way I drive! ;^)  TIA for the replies !

' 86 4KCSQ
' 71 AAR Cuda