emergency he can’t stand gas and just goes out

Hi people I have a huge problem with my audi 90 ng,I had you throttle flap removed and it fell rounder and when I put it back in, it started that it only started when it was cold and then you have to keep it always at speed because it just goes out when you don’t do anything, I put in a new throttle flap and it was just as now I don’t know what it can be. what we found out now is that when you inject the flap, it’s like t raises it even when it is warm.