Clicking noise at idle

What is your question?

I do know really how to describe it but my car works flawlessly no problems except for a leaky transfer case but the clicking noise only happens at idle a goes away when driving. Me I think its the timing chain bouncing around in there i do have 192000km on it no codes at all. Also is there a way to incress the limit for awd lock/get more power out of he engine like 188hp it feels like it makes 246hp at the flywheel I can already tell this engine been degraded of power cause its a SUV so it makes sense but still why have a v6 with 170 most he that are v6 have 300_200 alight I'll shut up. (Sorry on my tablet)