The Good news: Somehow, cleaning up the throttle position microswitch has improved the ride tremendously.
The bad news: The engine stalled twice today!! Back to square one.
I had a look at the contacts of the electromagnetic pressure actuator (fuel mixture sensor)and cleaned them up. I couldn't spot anything wrong. I'll drive some more tomorrow and see if this has made a difference.
Benzmac, can you please clarify what you mean by "a faulty spot"? How can the electromagnetic pressure actuator be diagnosed? Your guidance would be much appreciated.
190E 2.3, 1988