02 sensors is something I would not reccomend from a yard but if money s tight you can try it, just look for the newest car with least amount of mileage out there-If a u-pull it type of yard.
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Originally Posted by 12Ounce
I don't think your mileage is not that bad for "mostly" highway driving.
However, if you really want to check things out: Remove your intake manifold ... and inspect everything in porcess. It's a bit of work, including dropping the coolant level, but not that bad. A good opportunity to clean/inspect a number of important items ... and look for leaks.
I once found an original intake manifold gasket that had gaps (vacuum leaks) in it. Just a defective part.
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Taking apart an intake manifold for this particular symptom I do not reccomend at all there isn't a whole lot that you can really do from doing that as far as regular maintance goes.