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You need to check the vacuum hose leading off of the flame trap back into the intake manifold to burn excess carbon off. Sometimes people don't change the flame trap, or even remove it entirely, and then carbon builds up and causes excess back pressure; enough to cause some stalling and snorting and bucking exactly like you explain on a cold start. I had this problem with my 85 244 after I made the mistake of leaving it with a relative to drive while residing out of the home country. It was bad enough that it would actually cause the car to surge and almost stall is it tried to adjust.
Another item to check is the O2 sensor. As the car warms up, the O2 sensor is also warming up, and once it sends a particular single to the ECU, it goes from closed loop to open loop. If the o2 sensor sends the wrong signal, then the ECU will act accordingly, and cause the car to run oddly. Calming down once it has gotten to full operating temp. You will need a digital meter to check how the sensor goes through its warm-up routine.
I admit in each case that the car would start, but then almost instantly stall. AFter getting through that, that car was the happiest thing to start in ANY weather I have ever owned.
These are both two things easy enough to check, before looking on to things like the pressure regulator and the AMM, which I have seen cause some similar troubles.
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