lately my 2004 waja's autobox has been acting weirdly. when the car is cold/cold start, the gear change from first to second has been very sluggish. it takes a long time to shift into second and the when it changes the car jerks.

and when it is in second, and i apply the brakes to stop at a junction the car stops but the gear remains in second and it idles at 1500rpm. and when i have stopped for about 3 or 4 seconds, it downshifts again to first gear and it idles at 800rpm.

but after i have moved for about 2 to 3 minutes the gear changes becomes normal.. smooth shifting.. it only happens when the car is cold or not used for a few hours.

my car's mileage currently is 85000km and I have changed the ATF at 80000km. what could be the problem? is my gearbox showing signs of breaking down? and also the check engine light shows up for about 5 to 8 seconds after starting my car.