Sounds almost like a choke issue, if when the car warms up it runs better.
My car has always run well in the cold weather once it warms up for about 5 min. Its a little rough untill then though, but no problems starting or keeping it running.
Skyler
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-1989 Saleen Mustang #406-
TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20.
12.54@107.4 Motor
332RWHP, 350rwtq