Error 00561 2x in error memory

Hello.
after I gave Timm his V8 back on Sunday because I am on vacation from Wednesday, his car still keeps me occupied mentally.
To the problem. In the error memory is stored twice 00561. Once the adaptation limit has been exceeded and once it has been exceeded. In the 4.2l ABH year 92, everything has been exchanged and tested so far. So throttle valve poti newly added, idle controller cleaned, coolant temperature encoder for motor control, air mass meter and intake temperature probe exchanged.
When driving normally, there is actually no fault in the system, but if you take your foot off the gas and let the car roll out, it is wavy (lambda is 4-pole and also new). If you switch the gearbox to "N" when rolling out, the engine would have to go into idle mode until approx. Turn down 700 rpm, but he doesn't do it. It stops at about 1200 rpm and then fluctuates around approx. 300 rpm, only when stopping, the speed is regulated again, which is not the braking by the gearbox, because still in position "N".
I didn't find out about the search here in the forum and would have liked to have clarified that before my vacation.
Anyone knows the problem and can give feedback on how it was solved.
Greeting from Berlin Frank