Lately, my transmission has been shifting harder. Howerver, now that it is cold outside, it runs even worse.

If I don't let me car/tranny completely warm-up before I drive it, the car "stutters" real bad when I goto accelerate (especially when it is suppose to shift to the next gear).

As I mentioned earlier, once the car finally warms-up, it runs alot better (although it may not be perfect).

Does anyone have any ideas on what is causing this problem and/or how I can fix it?

Any information would be greatly appreciated.
Thank you.