My truck seems to be getting stuck between 1rst and 2nd. It will shift back and forth very rapidly then give a little bang and finaly stay in 2nd. Then from 3rd to forth I have to take my foot out of the throttle to get her to shift. My fluid level is good, color of fulid is good. Worse when cold, or just after a restart no matter what temp. Any ideas or experience with this problem. 14k on the ticker. Thanks for any help.