Infiniti Repair Questions? Ask a Mechanic for Answers ASAP
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After having 117,000 miles on the engine have the valves ever been adjusted?
If you have 117K on it then its is very likely they are due for an adjustment and that is likely the noise you are hearing. This would not cause a fluttering noise .
Not being there to hear it myself then I would do as he has recommended. You should be able to purchase the manual from your dealer and or there source.