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it sounds like the oxygen sensor is bad or the throttle positioning sensor or even the mass air flow sensor. take the vehicle to an auto zone parts store or a checker store and they will read the code for free and you will know for sure. most likely it is the o2 sensor

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Q: Does any one know which sensor needs to be replace on a 1995 Buick Le Sabre my check engine light is on and it run rough at times and its getting bad gas mileage?
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