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It your car is already running there is no way it's because of the battery because the alternator is producing enough of energy. There is only one exception when two or more chambers having short current. But it might the alternator because it's responsible for the electric current in the system.

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Q: Your 1997 Toyota Camry is sputtering and cutting off at idle The mechanic has seen it three times this year for this same problem claiming it was the alternator and battery What is the real problem?
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