hey guy's. i got a little problem. a while ago the tranny on my 325 was acting weard. its an auto, and felt like i was driving on a high gear. at about 50mph+ it would be fine but when i would take of it would lagg a lot. kinda like i was drivin stick and taking of at 3rd or 4th gear. this only happened 1 day and ever since its been fine. what can it be... do i need a new tranny?? or just a tune up?