Has your Water temp sensor been tested yet?
I am having a similar emmissions problem: http://www.peachparts.com/shopforum/showthread.php?t=115412
I will let you know if I cure it.
Marty

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-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14