Repair D-Jetronic MB280CE /8

Hi, everybody! A short time ago I came to a Mercedes 280CE /8, Bj75 like the Jungfrau to the child. Actually a wonderful oldie, if there were not one or the other Macke. In addition to cosmetic beauty repairs, first of all the not perfect motor run annoys me. This can be described as follows: – Car has no constant idle, whether warm or cold, but does not go out! – Engine does not really take gas when accelerating in the lower speed range, As a result, the car accelerates slowly, then suddenly the engine runs through – when driving in the low speed range the engine is jerking – all symptons are not necessarily temperature dependent, i.e. they occur both in the cold, as well as in the warm engine run. – Spark plugs, distributors and distributor covers are new Since I believe to find a variety of expert users here, there is perhaps the one or other, which can give me a hint for troubleshooting. Since I almost assume, that it is one or more problems with the D-Jetronic, the dream solution would be an expert user with MB D-Jetronic experience, which helps me with the repair, or even executes it (with me?). Thank you in advance for your answers and a greeting, Frank