This car has a rough idle low brake booster vacume at idle black smoke out tail pipe, secondairy air injection syst. code and is reading 65-75%engine load at idle. replaced plugs already, havn't found vacume leaks, replaced the complete wiring harness because it had the bad insulation,
unpluged the mass air and it still runs rough, unpluged the Lamda sensor, no change. fuel system is about 49 with ke on and 55 with vehicle running.

I don't have access to the benz scan tool just have a basic data & code reader.