A couple other things that could need replacing on a M103 of your vintage are the EHA valve and the airflow sensor pot.

When the EHA was bad on my car it would hesitate badly while warming up. Once warm, it ran okay. The idle was also erratic with a slight miss. If the EHA is leaking fuel at all, it is probably bad. I just replaced one that was bad but not leaking.

A bad airflow sensor pot usually causes stalls while idling or while driving with you foot off the accelerator.