Rough shifting

91 sunbird LE 2.0 OHC Automatic. I dont know what it is every time i go to 25 mph the car bucks and shakes. It only usto only do it going up hills at 25. What could have casued this? when i would screw around with my brother i would go into 1st on shifter then 2nd then Drive, could this have caused this? is their anyway to fix this problem? im going to change the transmission filter when it warms up outside cause it is freezing out.

the problem feels like it got a little worse over time.

this leads me to think that it might be something in the throttlebody casue no when i dive and it happens it i take my foot off of the gas and it stops. could it be the tbs(throttle body sensor). i got my liscens today too

the problem feels like it got a little worse over time.

how long have you been doing this cause i had a black 99 2.2l cavalier and i did that for about 4-6 months and it destroyed my car , torque converter went bad and my tranny was shot from it it might bee to late you might have already screwed your tranny

about last september. maybe since nov. or oct. it could even be the cold weather. its not really to to the point where the tranny is shot but it just does it when i have foot on gas i dont think it would be tranny casue the the throttle body sensor on my carburator is bad case we checked it and it is bad. i would change this but i cant get to the screws to take it off.