my shout is that -15 was a little too cold for the cts and that sent the message for extra fuel to be sent in thus causing car to run like a bag of shit! drain the oil and filter when pos and give it another try! had this happen to me once when I left mine out and it got covered by snow I'll try dig the photo out!
Last edited by Alvyn; 14-02-2012 at 08:59 PM.
Reason: pic added