I have a 85 with about the same amount of mileage. I just bought the truck and before i had it smogged i changed it. Its not that expensive ($35 from local parts store) and it took 5min to do it. Lets put it this way it .. it can only help ... <IMG SRC="smilies/usa.gif" border="0">
<FONT COLOR="Red"> I'd test it prior to just replacing it.. Check your service manual for the location of the "test connector" and for the expected voltage pulse reading. I've found that some high-milage O2 sensors become marginal. </FONT c>
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