Oh yes I do know about the X11 connector for the lambda duty cycle .It is on the left side by the strut tower above the EZL.
I was just wishing for additional diagnostics from the X92 8 pole connector on the right side of the car near the battery.
The duty cycle looks good and it fluctuates ,so it is working when I ck the voltage at pins 2+3 at the X11.
So maybe an ignition problem or one hell of a vacum leak

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg