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

My car got worse. After standing still for a week it wouldn't start at all. 2 things I did: I had just replaced my fuel pump relay. Turned out it was wrong. I jumped two plugs on the relay and it almost started. Then - I was absolutely sure the distributor cap was fine. It only had some 30000 km. I replaced cap and rotor anyway and since then it has ran perfect. CPS? I gave up

Sorry I saw this too late. CPS unlikely on these cars but all HT must be in perfect state with highest quality parts.

I'm glad it's running well now.

RayH

My brain is not working- "HT" means what? I'm having similar issues with my 91 300TE. I replaced CPS but no change. Intermittent no start when cold, intermittent stall at operating temp, almost never restarts unless engines cools down somewhat. Thanks,

In my case, it was the distributor rotor. Again, make sure all distributor components are of the highest quality and clean.

HT=High Tension. Coil, Leads, Cap, Rotor, PLugs. Ensure that all are of the right quality and in fine condition.

RayH