I have see now a good few standard Twinchargers with Plugs burning out. (& seen a good few tuned 1.4TSI/TFSI that had plugs going, that can be expected).   But today on a standard car with under 25,000 miles done and 3 Skoda Services i have seen the worst. It is a non oil burner, and run on 99 ron fuel only.   Nothing showing on the diagnostic & no 'Engine Warning light' or EPC light, But i felt a misfire and it was just a bit down on power.   So i took the plugs out, 1st, 2nd a