I have had my 01 S40 in 3 times for this. When it's cold I hit the starter and it fires then dies, the next time I have to it for a long time while depresseing the gas it will start and stay running, again it's a problem only 1st time ing when cold. Volvo dealer has 1.) replaced fuel regulator 2.) cleaned the injectors 3.) cleaned throttle plate ( this worked for about 3 days now it's doing it again) it gets down to about 30 -35 degrees F here.

thanks Jim