I have an 05 w/26,ooo miles. It's a V6 5 spd. convertible. In the winter when I shift it barely moves, even after I warm it up. It's like I'm starting out in third gear. eventually it improves as I drive. I also have trouble getting it into first at times. I love my car, but this is really frustrating. I hate to take it straight to a dealer without some knowledge as to what's wrong. Help!!!