this is a good thread:
http://www.peachparts.com/shopforum/showthread.php?t=62226&highlight=duty+cycles

and...
http://www.peachparts.com/shopforum/showthread.php?threadid=61858

these don't refer to your symptoms but give an overall assessment of the lambda and ignitions systems. As a tip that I would pass on, the MB manual states to always inspect/troubleshoot the EZL before the CIS

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89 300te 222,222
92 300e 190,000