Today when I started my car it was idleing high and when i took off down the road it took it a while to shift into second and it shifted hard, once it was in second it wouldnt shift into third. It is a th400 3 speed auto and this is the first time I have ever had any trouble. If I get on it off the start it is like normal and will shift through all the gears but if I take off slow it doesnt shift as soon as it usually does, it shifts from first to second at 35 and second to third at 60 and if I dont keep it above 55 then it shifts down to second and stays there till I get back up to 60.
Any info will help.
Thanks
Shane

 

Have ya checked the fluid