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Uphill?
Well, I don’t get the uphill symptom, or lack thereof. But I recently lost a water pump. It was definitely a rattle but I thought it was only at low rpm. Turned out, the noise volume of the rattling water pump did not rise as engine noise did. So at 3k rpm I couldn’t hear the rattle any longer and thought it stopped. Anyway, yours sounds like a chain/tensioner thing. Just suggesting a possible alternative diagnosis. An engine stethoscope is a good way to tell where the rattle is coming from.
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