I have a 84 e30 325e which has a high problem problem. When the car is cold it starts just fine. After I drive it after the engine warms up the idle jumps up to almost 1,500 RPM's. I have put in new injectors which now helps the car immediately in the morning. It seem like the idle control valve works properly. When I disconnect the wires going to the ICV, the engine idles up and down. It seems like the car acts backwards, when it's warm the engine idle jumps. When it cold, the car starts quickly, but idles around 800 RPM. Can someone please help me diagnosis this problem?? Thanks, anxiously waiting!!

inverted choke switch ?

Mercedes 190E too got that problem
something which i didnt even thought of was faulty!
and i forgot what exactly was faulty
some blower things
needed some repairs