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Message: <blockquote data-quote="68mustang" data-source="post: 1945017" data-attributes="member: 9584"><p>If it is not wanting to stay running when it is cold then it isn't going to be an o2 sensor IMO. The o2 sensor doesn't come into play until it enters closed loop mode. It's running off a preprogrammed mapping until the car warms up to operating temp. I'm thinking vacuum leak. How many miles? Ever done a tune up on it? It could be a coolant sensor maybe telling it the car is already warmed up when it's not and leaning it out.</p></blockquote><p></p>