48i cold start problem?

[absentmathis]

The past two days have been colder than normal for winter in Charlotte, at least this year...mid 20s. My 08 48i has been hard to start two mornings in a row. The battery is a little bit older but it cranks really strong and shows no other signs of weakness, and after 30-60 seconds or so of cranking (on and off) it will start, sputter and die, and then eventually start and run perfectly. Plugs are a couple years old, the car is pretty well maintained with no obvious issues or codes from a Carly scan. After getting it started the past two mornings it’s run and started perfectly the rest of the day. Even after sitting for hours. Any ideas on this?