Recently the temp's have been dropping into the 20's during the night and the FC hasnt been liking it. When I go to start the car in the morning, it will kind of choke for a second and then the rev's will turn smooth. I think it could best be described as a gummed up carburator that takes a few revs to get the fuel flowing. That's what the car does for about the first 3 seconds it's running and then it smooth's out. Any ideas what could be causing this?
Car: S5 n/a w/ exhaust and intake

 

Also, it only does this when its cold outside. During the summer and fall it was a smooth start.

 

as far as i know thats pretty normal on a cold startup.. my S4 does it

and if i dare touch the fuel while its cold she likes to die out on me.. but when it warms up its fine