when shifting from 2nd to 3rd (automatic transmission) the whole car seems = to jerk and shake, plus you feel it accelerate more than usual. It doesn't = do this with other gears, up or down. The odd thing, is that when the engin= e is cold, this doesn't happen, it happens after a while, when the engine s= tarts to warm up. No codes, no lights. engine has 74k and it seems that flu= id is about 1/4 qt overfull.