Timing issue

Howsit guys

I took my wifes micra k12 to a local mechanic to change the rings etc. Upon receiving the car back it struggles to idle and is lumpy on pull away. Got a few opinions that its the timing thats out. Mechanic looked again and said no the marks is fine.

I then took it to the nissan dealership whom confirmed the timing is advanced by 30° .

Can someone please give me some advice as how i can fix this. Or where can i get a free manual somewhere. Im really struggling.

Thanks guys.
 
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