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Its the engine struggling with high load at low revs. This engine does not handle that well. High load at low revs is harder on the engine than revving it up to redline, just saying. Dont drive in the 1k-2k rpm range if you need to accelerate. Gear down, get up to the speed you wanted to be at, then gear up again, your car will thank you and you wont hear the noise.
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