Hello! Since this problem is very common and I am only on the road here in the Omega & Senator Forum and I did not want to switch to the Astra Forum, I will ask you. The Astra F 1.4 Bj.95 my friend eats the spark plug regularly on the 1st cylinder After approx. 4000- 5000km the car catches in the cold state only to run on 3 pots and jumps and bucks around. And each time it is the same spark plug that gives up the mind. Every time (now for the 4th time) is the Ke I have to mention that car often goes with the temperature at 100°C whether city or motorway ( Thermostat and Wapu new). In addition, a very strong hydroclacker is to be heard under load, especially during the ascent. The spark plugs are therefore also not cheap parts from Bosch. Ignition distributor cap+finger and all ignition cables are also new. So slowly I don’t know any more advice and hope for your help. MfG micha