start up

Hello. I've posted on here in the past but lost my login access so I had to make a new account. You all have been great in helping me keep my Beetle going these past seven years, so I will turn to you with hope you'll aid me once again. 1998 with 107k miles, stock Since I moved to Charlotte...

I have a 2004 turbo S with 84000 miles. I drove it home from work yesterday, no problem. The temperature was in the teens. I parked it in the heated garage. I went to go to the store not an hour later and it won't start. It started but the RPMs would drop or the idle would and then it would...