Hi Rkc,

Having had a similar problem with my 190E, and having read thru a lot of other related threads, I would start by considering the following:

1) Clean gunk off Throttle Position Switch
2) Clean contacts on the Fuel Mixture Sensor and/or any other Fuel related sensors
3) Check fuse on OVP (Over Voltage Protector) and the OVP itself
4) Check Fuel Mixture Sensor
5) Replace Fuel Filter

I would do the first three checks myself and if it doesn't solve the problems, take it to a Mercedes garage to do the remaining tests (unless of course you can do it yourself)

Good Luck,
VJ

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190E 2.3, 1988