‘91 Audi coupe difficult cold starts

[Christopher Gharibo]

When the ‘91 coupe is overnight-cold and the temp is less than about 25 degrees F, the engine will start and stall in one second. This will happen 4-5 times, even when I help with the throttle, gradually improve with each attempt until the coupe eventually fires up and runs fine.
 
It’s as if something needs to heat up and I am doing that by the multiple attempts until it finally catches. The colder it is, the worse it gets. It never happens when warm. 

The battery is powerful, changing the fuel pressure regulator made no difference, fuel filter is fresh, injectors are new, there are no codes. 

Please help. This has been happening every winter for years. 

CG