I have an 05 Mustang gt. When it gets really cold, mostly when it gets to snowing temps, i can be just cruising at any speed, any rpm, and it will keep hesitating or stalling. it wont actually die but it will be like i suddenly let off the gas and hit it again or like i turn the key off and on again. one time it was so bad it kicked me into fail-safe mode. when it gets midly cold i can be cruising and it will sound and feel almost like its running out of gas. and it will always throw running lean codes if its cold. but i know it has to be something related to temp because when its warm it runs great. Any thoughts?