K12 1.2 and engine top cover gaskets

Hi! I have a very big problem with my car. For some time, the gas pedal is very lazy, the whole car shakes at the stop, I hear misfire's. I exchanged: air filter, spark plugs, ignition coils. I also clean throttle body. Nothing helped. I came to the conclusion that perhaps the problem is the gaskets. Perhaps the engine is getting illegal air (or maybe someone has another idea?).

Therefore, I have a question: what are these collector gaskets called:
https://i.imgur.com/tmkfhGt.jpg

Does anyone know where you can buy this or what are the numbers in the Nissan catalog?

I'm sorry for my english and very please for your help.
Thank you in advance.
 
Back
Top