Well Thank you dpetryk, that's what I needed to know - The basics. I've read somewhere to do a "static" lambda test and the values without the car running should be 70% Fed, 85% Cal. Well I was at the other end of the spectrum.

Interesting how you mention lambda is not used at idle for some vehicles, well I've come to the conclusion that this is the case for my 1988 190e 2.3l

No matter what I did, at idle, the value (voltage, where lambda = 1-(V,in/ VCC)) would be way too high. This changed whenever the accelerator pedal was pressed (causing the microswitch on the accel cable to open) and I was getting reasonable lambda readings (4-6 volts or roughly 50% duty cycle), but the car would stall at idle, until warmed up then it would idle at 2000RPM.

After much viewing of threads and reading up on links, and looking at parts pictures on fastlane, I figured out how to adjust the fuel mixture. I cranked it up a bit and now the cold idle is fine,,, time to check chain stretch and tensioner,,,

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