Hello. I struggle with uneven idling and heavy starting when cold, it also happens that the engine goes sour. I have tested and checked this and everything is correct/works

Is a 1986 mod converted to b230f with control unit 561 and 169

Gets error codes 1-2-3 and 2-2-4 (returns after they are deleted)

Water temp sensor (new and correct type for the brain)

Idle regulators (works as it should)

Lambda sensor (new but nothing happens when I unplug it while the car is running)

Lmm (works as it should)

No fake air

Cold start nozzle works (but not by the brain)

Goes up to around 2000 revs when cold but does not go down when the engine is warm (must adjust the screw under the throttle to get the revs down)

I have also tested other control units without any help

I hope someone has more ideas on what could be wrong and can help.