To answer mbshop, we are talking about a 190 with 2.3 litre M102 engine and KE fuel injection. This is a mechanical system with electonic aids. These aids are the idle speed control, cold start injector and electro-hydraulic actuator which fine tunes the mixture. If the OVP goes bad then the electronic aids don't work but the car usually still runs, unless it is badly out of tune or has some other fault. I cannot imagine this type of engine cutting out at speed because of the OVP - my 230TE ran fine for 6 months with an intermittent OVP.

Other engines, especially those with fully electronic fuel injection usually don't run at all if the OVP goes bad.

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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)