So i changed the check valve, fuel filter and regulator.
The bike got a bit better, but not 100%.

So, is there anything else that should be checked?

 

So, a quick update on my issue.

I saw that there was a lot of oil on my air filter and remembered that I had overfilled the engine oil the last time I changed oil...
So after cleaning the IAC valve and the MAP sensor with some carb cleaner, the issue went away.
I will redo the breathing on the bike, so it breaths into a catch can instead of in to the intake, I guess that this will solve the problem for the future.

 

I have used brake clean, but I believe you are supposed to use sensor cleaner. I bought a can, it was cheap, will last for years.

 

So... The problem came back..
The bike run great after cleaning the MAP Sensor and IAC valve, but that didn't last for long.
The bike started acting up again, so I tried cleaning the throttle body once more, but this time no success....

Im getting hella frustrated now, thinking of just carving the f... thing and move on....