transmission problems

[jakarra]

Hi i have a 98 fairmont AU 1 and in the last few days it seems to run fine for the first 15 20 min then seems to stick in 3rd, on the freeway it will run fine but when taking off from the lights it feels like im driving in 3rd very slow revs dont go way up its just slow untill it works its way up. does anyone have any ideas??