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1990 Deville 4.5 L decreasing fuel economy

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Hi, I posted this previously, but perhaps in the wrong forum....I own a 1990 Deville, 51k miles, great condition. Can you guys tell me, is it a difficult job to replace the o2 sensor in these? The tranny seems to not want to shift into overdrive, either, although previously it was operating normally. These two problems seem to provide me with terrible gas mileage, the exhaust smells "rich", but it idles smooth. Any suggestions? 

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