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@TRA
Probably, there weren't too many variations. I think KE just means an electronically controlled ignition??
found this - clean the airflow sensor (big alu bowl) and centre the plate
http://www.benzworld.org/forums/w116-s-se-sel-sd-class/1223523-bosch-d-jetronic-k-jetronic-troubleshooting.html
Runs rough (warm)
1)Warm control pressure incorrect;
Incorrect warm control pressure that is too high or low will cause an incorrect air-fuel ratio,thus resulting in a rough idle.
2)Airflow sensor adjusted improperly or binding;
If the movement is not smooth,it will result in air-fuel ratio errors.Check for centering and correct rest height.
3)Leaking cold start valve;
Again,will result in overfueling the engine,resulting in a rough idle.
4)Injectors have an unequal flow or spray pattern;
Do an injector flow test and replace any that do not
deliver the correct amount of fuel or have a poor spray pattern.