1993 190E 2.6L stalling
 

I recently bought a 1993 2.6 190E $560. The previous owner sold it because the car had several issues and was tired of putting $$ into the car. I have been able to resolve most of the minor issues, but the car stalls at red lights once in a while. The previous owner had a new MAS sensors, fuel pumps, idle control valve and two differnet MAS control units (the one in behind the OVP relay) replaced. I just put in a brand new OVP relay. I have checked the vacuum lines and can't find any leaks. I was told it could be a coolant temp sensor. any one have any idea where I could go from here? Also the car does leak oil, could it be loosing compression somewhere? :confused: