Check the coolant temp sensor(s) and if good, proceed to check the cold-start injector. If no luck there, the fuel computer is likely suspect. See if you are getting 12v to the cold start injector when cranking cold.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition