Nissan Repair: Car slow to start during cool weather season, nissan altima, weather season

Question
I own a 1998 Nissan Altima that does not start at the first stroke of the key, especially in cool weather.  I recently had a complete tune-up, changing everything from the gas pump to the distributor and spark plugs.  My battery is new and I have been told my starter and alternator are fine.  The car takes a while before it starts, but once it does, it runs like new, with no additional problems.  I am worried about travelling very far for fear of getting stuck.  What could the problem possibly be?
Thanks.

Answer
I am assuming that the engine is cranking just not starting. First off do you have any aftermarket items installed such as remote starter, alarm? As far as the tune-up is considered did you use aftermarket components? Also cleaning of the throttle chamber was not mentioned. Do not use aftermarket tune-up parts. It will cost more from the dealer, but these parts are specific for the use on your car. I have seen many problems due to incorrect parts being installed on vehicles. Lastly if the check-eng light is on please write back, as any codes will help me with pinpointing your concern. A dirty throttle chamber will not let enough air into the engine causing a choked condition.