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What is your question?
the engine in my Infiniti i35 started knocking started off slow has gotten progressively louder sounds like it's coming from the upper driver side part of the engine may be the middle doesn't sound like a stirring rod that thing would have done it alreadyis it common for this car and could it be the serpentine belt?

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Recommend you stop driving the vehicle to prevent what might be minor problem from becoming a very expensive problem. Tow it to a shop and have it checked out.
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