Greetings, the engine runs very unevenly and shakes in the stationary gas. The speed varies irregularly between 200-900 revolutions. I had installed a new head gasket, in addition curvature seal and those of the intake tube. The Lambda probes, spark plugs and cables are replaced, no improvement. 2 cans brake cleaner I have now emptied in the whole engine compartment, but it showed no effect. A tiny small hair crack I found in the valve lid. I made it with glue, doc h unfortunately this doesn’t seem to be quite dense yet but that doesn’t matter in my opinion even if it discreetly contributes to it. I used to be able to start without giving gas, now it goes out immediately when trying, because it simply does not hold the 850 revolutions. I will soon install the temperature sensor (switch) for the warm-flow controller because I destroyed the current one and check the ignition time. The candle picture was dark golden brown. Could a changed valve play a otherwise the car is well in shot to the surface rust, while driving there are no problems. Mountain from 202 kmh.