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    Sudden drop in performance and gas mileage

    I have a 2000 Jeep Grand Cherokee 4.0, 6 cylinder. My car, intermittently has a sudden drop in performance and gas mileage and the exhaust fumes have a very distinct & strong odor as if it is burning very rich. My gas mileage goes from about 20 mpg (highway) to about 4 to 6 mph. it will remain...
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