Mini F56 starts badly

Hello, I already told him another post about my mother’s mini. He makes cracking noises at the cold start.(Probably heat protection sheet) A few days ago, however, started to make a very tinned noise at the cold start. How he would have a short oil shortage. (See appendix) Today started and went out directly again. On the second attempt he then jumped and then turned up the speed to approx. 1400…about 5 seconds later, however, this is then to 900 and then the speed went up and down. The clacking noise was there all the time. When trying to drive a piece forward. He immediately ran out. Again he started and he did exactly the same. Then I let him run and turn it off. After about 10 minutes we started him again to drive up and down the road once again. But he then started to stutter…how he would not get a fuel for a short time… I’m really stunned what that could be …. Did someone have an idea? e ? PS: I read out the bug memory recently…it was written in it that after the injection was released the pressure was too low…