Won't start - cold outside

1993 Eagle Vision TSI 3.5 engine, over 100k miles
It wouldn't start when it got very cold a few weeks ago, but started when it warmed up.
Now, the temperature outside had dropped again, again would not start, but it has warmed up outside and will still not start.
hold down the gas and you can hear that is wants to turn over, continue to hold the gas and you can smell gas. All lights and electrical still working perfectly.

Antifreeze is not frozen. Please, do you know where to begin looking for the problem. Diagnostic cable was torn out by previous owner. Has has tune-up within last 15 months.