Probably a Cold/Fuel problem. My 95GT struggles to start at first if it is real cold and it has sat for a while. a little persistance or some heat help out. When it gets that cold some fuel additives may help out.
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White 1995 Mustang GT
Dynomax Cat-Back, Offroad H-pipe, K&N Filters w/o Air Silencer
My 1995 Mustang GT