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Intermittent as in randomly despite driving style? Or just when the engine is idling? More details of when you hear the noise please!

Could be one of the belt tensioners
 

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I'll bet money it's the cam or aux belt tensioner. There's multiple ways to diagnose, but the cheapest is to put a screwdriver on it and put your ear to the screwdriver. It'll amplify the noise, but be careful not to get it trapped because you'll explode the engine.
 
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