I have a 03 Gt with auto transmission and for the past couple of days it has developed a problem. The problem is that when my car shifts from third to 4th(overdrive) it takes it a second and finally goes in. Then when I give it just a little bit of gas it drops into third then back into fourth. I have no service light on and was wondering what exactly my car is doing? It has 72,000 miles. please help.