The problem you are having is related to the ISC/CC computer & throttle actuator. Diagnosis should be done with a scan tool & many times the problem comes up with control module fault when the problem is really the throttle actuator.
OF course start by cleaning the throttle housing & butterfly.
EDIT! note; EFI cars like this one doesn't have a fuel accumulator.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)