I have been experience exactly the same problems with my M102 engine.

One symptom that I also noticed is that sometimes when turning off engine but keeping key/ignition on the tachometer makes same jumps all the sudden and the fuel pump starts for a second. This is usually at operating tempature, about 80 degrees celsius

For all I can understand is that something is triggering the fuel pump relay briefly. Could a faulty CPS trigger this? I did measure it with a multimeter but it's within specs. Same goes for the coil.

My car is regularly maintained and plugs, distribution cap and rotor and wires have been changed. Well since I already drove the car my first 100 tkm perhaps it's time to change them again.

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'87 MBenz 190E 2,3 8vlv