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. it soes it every time at 25 untill i give it more gas.

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 :)

ytester day when i degresed the engine i got water in dristributor so let it drie out but when i went to blow off pluggs i pulled wire out of boot on one of the cylinders (this happened on sme plug a while ago so i had it reclamped) i bought new pluggs now thier are no problems. :grinyes: :grinyes: