Hello dear Motor-Talk members, have a bigger problem now…… My Seat Cordoba Bj. 98 MKB ALM 75PS can be very difficult to start and only with gas. When it is on, it stutters like wild, runs rough and takes only heavy gas. Spark plugs are all black…. the exhaust gases likewise. Quite large spot if it remains on. The idle rotations are at approx. 1100-1200 rpm. Very strange smells perceived–how lazy eggs… spark plugs of the 3rd and 4th cylinder corroded. Unfortunately, I have to cross-change. But since tomorrow I need the vehicle (seasonal vehicle is now in the garage) I drove with me earlier…. More bad than right… When I arrived home, I looked under the car and have seen the GLÜHENDEN KAT, which may cause me a little bit of help. I also came to it because it smelled so funny after lazy eggs. Now I don’t know where I should start.