Nipperiley
I have no experience with fuel distrubutor failure but another item that IMO could lead to similar symptoms is the air flow sensor potentiometer. This is a 45$ part (not sold by the dealership but available from Bosch) that tells the main computer the amount of air entering the engine. It typically wears first at low RPM because that is the range the engine operates most of the time. A worn potentiometer will misinform the main computer. Good luck, Bruno