Remembering now, some one came to me with a low rpm engine knock, asked me what is wrong, as i remember the car was at idle and you can hear the valves ticking like a slight knock, then pass 1500rpm it goes away.
Solution, changed brand of oil used in the engine from Valvoline to Royal purple or Nissan Easter oil 5w-30.
The tick was gone, but in my opinion it does that on old oil.(filter is clogged and less oil travel through the engine during low rpm.)
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Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you.  537whp/496lb/tq@8-9PSI 93 octane
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