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Diagnosing, testing and general poking around is the best .Did you read the Posts by Jamessp ?
If the O2 sensors are all the same age - replace all imho. Not cheap - but your time and sanity.Don't replace just 1.
The Mighty Vac tests are an easy and non-intrusive way to start diagnosing.
Mentally prepare for removing the alternator.Start by trying to loosen 'that' bolt.I did it all w/o removing the inlet manifold but you need to be a contortionist with perfect tools and lots of patience.
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