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the noise is most likely from loose valve adjustment
As the valves are hydraulically adjusted , that would indicate a failure of the cam followers with a loss of oil pressure as a result
If the valves are not correctly adjust because of the failure, there will be an idle problem and poor performance from the engine
you have a rev limiter on that car. DO NOT OVER REV. the engine. The clacking sound is more then likely your valve tap-its from being over heated. Replace your thermostat and make sure you change your coolant every 2 years. Sounds like your thermostat is stuck open. Replace your thermostat every year or 2.
Sounds like your valve lifters. It's possible that they drained the oil and never refilled it. This does happen when they go on break or lunch half way through a job. They think they added the oil, but did not. Out you go, Mr. Clack-Clack.
It sounds like you have a valve or rocker issue, I would run an engine cleaner through the engine. I suggest draining 1 quart of oil, pour in the cleaner and run engine for 5 min. Let engine cool and drain the oil. Pretty much another oil change. This will hopefully clean a sticking valve if this is the issue. But I also would check for anything hitting the pulley's or fans that may have came loose. I've seen this a lot. Good Luck. It may take 2 cleanings for the engine, so don't get disappointed.
When is the clacking sound herd? Starting up only,idleing,on a pul, or on acceleration ? Can you pin point where the noise is comming from,front of engine, top,ect? Does the oil lite flicker at idle,or is the oil pressure low after running by the guage readout? What engine do you have? 4 cyl or v6? Is it high mileage? Valves may need adjustment,if they are not hydraulic type.need to know what engine you have!
Best thing to do is take it in to see if the oil pump is working properly. A oil pump not pumping properly will lead to what people call a "dry valve tap". The moving parts in the engine will make noise when there is no lubrication happening. Especially the parts that are moving the valves. That why they call it " dry valve tap".
Has the engine light stayed on at all?