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Same syptoms on a 190E 2.3 lead to the fuel pump relay. I would:
Fuel system:
1. Check the idle control valve.
2. Check the fuel pump relay and filter.
3. Check the fuel pump.
Ignition system:
1. Cap/Rotor and related components.
Investigate one thing at a time until your diagnosis is accurate. After elimanting those things, then further work will be needed if not solved.
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