I had a similar sound, clatter/tick at idle, went away with throttle.
Mine was a failed intermediate shaft chain tensioner.
Regards,
Silber
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2002 Boxster S - Silver/Boxster Red
Coilovers - LSD - CAI - High Flow exh. - F&R Adjustable Sways
LN 3.2 to 3.8 - parts acquired, pending assembly and tuning
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