Chattering/Chittering At Highway Speed

#1
Hey guys,

Never noticed this until now. But I was driving close to a Jersey barrier at around 55-60 and as my window was open and easier to hear the car with a wall next to me, i heard chattering coming from the engine.

TBH, it kinda freaked me out. It sounds as if the valves or the timing is off

Anybody else has this issue???
 
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