As per edit note
For the noise, when it is happening at idle, open the needle valve gradually and does it stop?
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As per edit note
For the noise, when it is happening at idle, open the needle valve gradually and does it stop?
Is it manual? If its manual then thats the standard gearbox chatter. Sounds like rattle or pinging .
Got the solution for the noise.
Seems this is normal. It was enhanced by the vacuum leak that I had. Once I fixed the leak, the rattle almost went away.