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Does your noise sound like a baseball card in the spokes of bicycle? And is the noise coming from the top of the engine under the intake manifolds back toward the firewall?
If so your Titan most likely has the same problem as mine, its an over zealous fuel vapor purge valve.
My dealer is aware of the problem and they tell me the Nissan engineers are working on a new purge valve. No worries, it will not harm the engine.
TH
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