2.3 NG Motor Spring sucks and the consumption is 14.5 liters

Hello guys, I have a problem with my 2,3 NG again, if I had to start it in the morning he would have to turn it because it’s cold so around the 1100 and when it’s warm the speed goes down to 750, but that’s not what he does after 100 m already goes down to 750 revolutions but that’s not all, it does with that, he jumps on then the speed drops to almost 0 rounder and he jerks and jerks and also does not take a bit of gas, after 30 sec. It runs almost normal and when he there nn so 500 m he runs again like the sow he hangs really super on the gas. Oh and the consumption is in my opinion also a little too high 14.5 liters. That’s what he does only when 2 to 3 hours stands or has stood overnight. Oh and about the search function I have already searched but found nothing real. Greetings