Occasionally, when I take my foot away quickly from accelerator pedal, I hear metallic clicking noise.
Is this normal?

I once drove a 12 year old 190E whose clicking noise is much louder than mine.
However, I also drove an automatic transmission car that does not produce such noise at all.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.