Can you guys give me suggestions. 2001 Chevy 3500 Duramax/allison. When you slow down but dont come to a complete stop then take off the trans is abviously in neutral or ???. As soon as the rpms jump it slams back into first. If you com to a complete stop it does the same thing however will engage in gear without applying throttle after a brief sec. Doesnt seem as bad in tow/haul mode. Tranny has been flushed and spin on replaced. Changeing internal filter in the am. Seems to me like its loosing line pressure or something. Any ideas would be appreciated. Thanks Wilson