Car still starts badly!

Hello! My Audi 80 (1.8S, BJ 11/1987; JN engine), still starts badly in the cold state. I always have to give gas, otherwise the engine dies immediately. After about 10-15 seconds the engine runs almost normal. I have already changed the temperature sensor (white) but the problem still persists. Maybe it is possible that the cold start thermo-feeler is defective? This is expensive (75-80 €)! That’s why I wanted to ask in the net what else to do. Greetings