Recently, my 1991 190e 2.3 started to hesitate and even stall after a cold start, when I'd put my foot on the gas to pull out of my driveway and for the first minute or so afterwards.

The car starts right up and idles fine, cold or hot and this does not happen at all after it's warmed up.

I was thinking it might be an enrichment problem, since it feels like I'm trying to drive a carbureted car without a choke after a cold start. The engine just stumbles and wants to die when I hit the gas.

The CIS temp sensor and the air temp sensor (at the air cleaner) were replaced about two years ago, in an attempt to solve a different problem.

Any ideas on where to start looking?

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2000 c280 Sport (looks like an upgrade, feels like a downgrade)
1991 190e 2.3 (sold)