Ok, so I was leaving my friend's house in Deposit, NY, the other day. It was around -10 degrees (F!) out. The car started right up - normally
- on the first turn. Like any other time. So, I rev it a little, then let it sit a minute, then turn on the headlights, while the engine was revving around 2,000 rpm. Take my foot off the gas and it flat out dies. Restarting was hard - it wouldn't restart with my foot off the gas, or with a bit of gas. Acted like it was flooded. A few seconds with my foot to the floor, then about 10%, it started up again. Let it warm by manually revving it around 2,000 rpm until the temp gauge needle started moving up, and it then idled fine with my foot off. No problems at all.
Other things - the car's been getting rather low highway mileage - in the mid 30's - I don't know if it's my leadfoot or what. This start and stall issue happens at least until the 20's or 30's. The car otherwise drives just fine in the cold - no issues at all.
The CTS was replaced a while back, didn't help.
Any ideas, anyone?