Every time I start Serenity I feel and hear a clunk from the engine bay as soon as i turn the key, the clunk does not happen if the engine is warm when I start it. I was thinking maybe starter? Is this a sign my starter's gear is going bad? Could it be something else entirely? My motor mounts are new.

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Serenity-86' 300SDL 482,000 miles (on a "14" head!)