Agree with onehundred80.

I just come back from a road test, and something weird is happening now, didn't notice that before.

When the car is cold, the engine is shaking a little bit with a low idle. And when it's hot, sometimes, when the stick is on neutral, engine is going up to 2000rpm with no reason

Don't know what's going on. Wrong part?

Here is the brand new box (Bosch P/N seems OK) and the old part.







On the old one, some numbers:

0 232 103 050
07-02-19
A 004 153
96 28

Any advice? Swap back the old one? Does the ECU need some time to adjust its settings?

I'm a little bit puzzled...