Very Very rough start-up!
 

i have a 08 gti fsi
when my car sits for a longer time like overnight the next day it has a little bit of trouble starting up.. and a couple times now when i turn the keyy it tries starting and cant.. it starts on the second try.. what is this problem.. i still have warranty and i am bringing it in soon but they said that they have to duplicate the problem.. and after it warms up it doesn't do this.. whats something that can be wrong i can tell them to check?