[Paulporsche]

I see you are new to this forum. Welcome, and when you get a chance, post some pics of your car.

You should use the search fn of this site. There is a lot of info on CIS cold start/warmup problems.

Generally speaking, you should first make sure all your ignition components are operating to spec.

Then check for vac leaks.

Get a CIS fuel pressure gauge to check pressures. The cold control pressure is particularly important. Other local Pelicans may have one they can loan you.

Jim Williams' website on CIS is very informative. So is the Bentley Manual for SCs.

You don't say where you are, but I'm guessing it has recently turned colder there and this is a recent problem.

Most of the time, this happens because the WUR is out of spec, w/ a cold control pressure that is too high, resulting in a mixture that is too lean @ startup. Sometimes the mixture is simply set too lean.

The AAR and AAV sometimes are out of spec or not getting power. The AAV helps the sensor plate rise by giving the system extra air @ startup. The AAR keeps revs up during warmup to prevent stalling.