As it turns out my 1985 190e 2.3 was running on a partially faulty fuel pump for some time. The sound of my fuel pump was rather loud and the flow of fuel was erratic (outside the silent hum of a small electric motor that it should have). I eventually burnt out 2 fuel pump relays. Once the pump was replaced, it ran perfect, and the replacement of the fuel pump relays ceased.
My fuel pump was $122.00 at Fastlane when every other place I checked locally wanted close to $300.00. My mechanic received it the very next day. (No I'm not affilialted with Fastlane. But I've done my research, and they have the best prices).
1985 190e 2.3
1990 BMW 325i
1981 Mazda RX7