Speed goes into the basement!

Hello, you. The following problem cannot be solved. My V8 is in a carport. To get on the road, I have to drive about 20 meters backwards, stop. The car is then still standing on the lowered curb with the left front wheel. Then I get out, close my gate, get in and put R back in. Then the following happens: the engine goes to the knees, sometimes until shortly before going out. I replaced the following: pressure regulator, intake air temp. Sensor, petrol filter, cooling water sensors, spark plugs, lambda probe, distributor caps. If the car rolls out of the carport, everything will work out wonderfully. He only catches that sh... the second time he goes backwards. - No. This morning it was three degrees plus. But he did the same thing at 14 degrees minus. When I stop and put D in and go, everything works perfectly, even if I stop the next time and rank again, no problem. What can that be? I hardly think that the wrong gear oil level is switching perfectly and then the error would have to occur again after 9 hours of standstill (working time). Had once suspected that there is too little oil in it, dilute itself by the warming and thus the machine is lubricated enough again. Only then would the machine have to be in the same mood after the 9 hours. Although, when I walk home from work, I drive straight forward. It's just that he's going straight to normal, and then I have to go ahead, get out, and fold up this shut-off. So it's a short time. Less long than in the morning, because when I switch to D and roll off, it goes gaaaaannnzzzzz minimally to the knees. But hardly noticeable. Oh man!!!! I hope you understand what I mean. Could be a weaker battery. She's not so fit anymore. But if the car runs, he'll get the juice from the LIMA. And that's enough juice. Help me!!! Ps.: there is nothing in the bugstore.