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Hello, my name is Andrew. I am a Kia & Hyundai certified technician, so maybe I can help. Can you tell me if you know what led them to replace the transmission? Also the fuel injectors?
Without the vehicle in front of me in a situation like this it is hard to give you any specifics on what it could be. However, I would mention to them to look at the electronic throttle control, as well as cleaning the throttle plate. There have been many issues with the Sorento and those things causing a hesitation. I hope this helps.
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