Nissan Micra k12 1.2, after firing revs are waving, it fires hard

Hello, I have a problem with micra k12 1.2. The car starts hard, after firing, the revolutions wave for about 5 seconds and calm down, but the car can go out even while driving.

He was at a few mechanics, they replaced the throttles, after this operation the revolutions were still waved a bit but did not go out for a few weeks. Now the problem has started to appear again, more and more often it goes out while driving. On my own I changed the variable phase sensor, lambde probe (after removing the old one it was all black and not ore), candles, I checked the pressure on the pistons is ok, and I replaced two coils.

The check engine lights up in the ignition, I checked the code and it displayed p0300 and p0340.

Thank you for your help,
Regards.

Check the tightness of the intake system. It is possible that it is pulling "left" air.

I checked the tightness, everything is fine.

The condition has worsened, I read from the error that there is a camshaft position sensor error. After firing the car goes out and, oddly enough, death with oil, despite the fact that gasoline is flooded.

dawid46stg wrote:

death with oil, despite the fact that gasoline is flooded.

Maybe someone made a mistake refueling?
Check the camshaft position sensor - contacts, mounting / positioning, or substitution if necessary.

Nobody probably got it wrong, because it smelled of oil before and I went to refuel gasoline specially, because I already considered this option. I wonder one thing, why rpm wave after starting the engine, that until it goes out if it does not gas properly and after a few seconds it calms down? Can this be affected by the said camshaft position sensor?

dawid46stg wrote:

Can this be affected by the said camshaft position sensor?

Probably not. Wavy turns are usually "left air" or dirty throttle. However, this is not a rule, so it is worth checking more carefully.

There was a solution, after reading the error codes again, I decided to buy a camshaft position sensor. I replaced it (I am on the right side of the block when we remove the entire lid, the top part with the carburettor and filter). When removing, I noticed that there was one gasket on the manifold and it was "sweaty", so maybe it was catching the left air through it. After replacing, clearing the CHECK ENGINE error, micra goes like a dream, and the error does not appear. The rotation does not wave and does not go out.