If the lambda sensor goes it will be stuck in its last setting so when cold could be running too lean,like when you forget to use the choke,or maybe its the cold start,if there is one on a jeep.Had a similar problem on an XR3i years ago,cold start went and it was a bitch inn the mornings in winter,not so bad in the summer though.Dont know about the air flow but im guessing there must be a way of testing it,and the lambda maybe,although Dr Mike will be the one to give a definative answer i am sure