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There can be a variety of problems wrong.
1. Change the oil 2. Check your O2 Sensors 3. Try a fuel injector cleaner 4. Check your fuel injectors (a bad injector is causing me to get bad mileage) 5. Check/change your spark plugs
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When Coolant sensor is bad on 1997 jeep grand Cherokee what effect does it have on proformance?
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