Timing chain and related problemd

hey guys
i just changed the timing chain on my Micra 1.2 65 hp( very interesting operation) in the parking in front of my building and everything is fine but I have some issues and I dont know if they have anything in common with timing chain.
i dont have 900 rpm on neutral like before i have like 750 rpm
if i start the fan it goes to 900 rpm and the motor becames so so so silent.
if i stop the heating fan the motor is shaking and it goes to 650-750
Also the torque in the 3 rd and 4 th is not like it used to be 40000 km before when the timing chain was ok
the only thing that changed after changing the chain is that I don t have the P error anymore, the motor starts ok and is extremly silent but it is not like before with the original chain.
any ideas?
sorry for my english but I am in France!!

Sent from my Lenovo A6020a40 using Micra Sports Club mobile app
 
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