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2012 Porsche Cayenne Questions

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I had a fuel injector failure (engine light came on, car shuddered). I was advised today that the fuel injectors have been replaced, and the spark plugs have been replaced, but the car still is not running correctly. Now they are testing to see if the valves have been damaged due to the large amount of fuel dumped into my engine. This vehicle has less than 16k miles on it. Is this going to effect the vehicle in the future?
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