Check Engine P1230 throttle valve

Hello members, I’ve already searched various forums for the error message P1230 and received many hints. Unfortunately, everything seems to be wrong with me. My Saab starts normal only idle speed is lower than usual and it goes out again if I don’t give gas. It accelerates normally and does not jerk. Vmax over 100km/h are no problem and accelerator pedal is no different than usual (note on Boudenzugbetrieb). Can this be to Kriechstömen, Über or is it really the throttle flap that would be to be exchanged? I am really grateful for hints. Greetings Alexander