Hello together, I suddenly had an extremely undisturbed idling speed at my 2006er-Opel Combo 1.6CNG (engine Z16YNG, similar to the Z16XE) (the day before he drove 300 km without a complaint) and a very jerking way of driving in the domestic 30s zone. Shortly afterwards the engine control light went on, so I drove directly back home. The car then had a very clear speed variation in the stand (between 400 and 800 rpm again and again up and down) My Blue Tooth-OBD2 device then revealed: And in a second selection process it was also noticeable that the jerking did not change when I switch between petrol and gas operation. (Until now, it has always been the case that when an ignition module, which is only noticeable in gas operation, and I was able to drive home with petrol still free of friction – because gasoline just ignites significantly easier than the natural gas with its 130 octane …) In the hope that the 300 codes will say goodbye by themselves when d ie P0105/P1105 cause is fixed, so I started with it. First the MAP sensor checked, but unfortunately it did not seem to be the cause (because it would be easy and cheap to replace). The 5V were attached to the plug, and if you give negative pressure on the opening, the voltage falls on the middle contact – so as it should be. So again installed. Next I removed the throttle valve and cleaned thoroughly, which was not even so dirty. Also the blow-by- Drilling seemed to be still free. I then, simply to scrape out existing oxidations from the potentiometers, a few times completely opened and folded. Then I installed them again. After that I reset the error codes, and started the engine again. The idle fluctuations were gone (so the action with the throttle valve might have brought something). But occasionally there are still clear ignition oscillators. That’s why I then detonated the spark plugs. ut. All four look almost the same, just like on the attached photo. The candles have been installed since about 15 TKm. These are metal droplets at the top of the electrode. Does this fit together? Due to the problems with the intake too much air ? too lean combustion ? candle starts to melt? I have now ordered new candles and for safety reasons also a new ignition module, but am I unsure whether I have cleaned the problem with the throttle flap + new candles sustainably eliminated the problem? GR and secondary air problems should not occur with this engine (a lack of AGR and a lack of air mass meter), right? And the injectors will not be the case if gas and petrol (with their own injectors) show the same error behavior? What do you think is a sustainable repair, or should I check other things?