Ok. I took out my OVP once again and cleaned the connectors off. there was no visible dirt but i did it just in case. then i put it back in and started on my 600 mile journey. Needless to say not once did the rpm go below 500. Note that the temp outside was well about 90 degrees and i had the air running. I did not expernience any stalling or vibration due to a low idling throughout the trip. On occassion I also had 3 other people in the car and it still did not dip below 500rpm. So i will take it that the OVP connectors just needed to be cleaned. Im hoping this is a permanent fix, although something tells me that wasnt a fix because it didnt cost $$$.

*** Also, the ABS light went out during the whole trip so not only did cleaning them fix idling, but also that irritating notion that the ABS light is on! Looks like we have a temporary fix.

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1989 260E
- 300E engine
1998 C230
1995 E320