Why does my car jerk at times at 40 and 60 miles hr on 1995 Toyota Tercel

I have a 4 cylinder automatic that will jerk hard at times when accelerating at 40 and 60 -65 miles hr I have replaced all belts and sensors within 2 years could this be transmission or another issue ?

2 answers
My guess= engine misfire. How long since last tune up spark plugs ect.? Possible coil or plug boot breaking down, there are four.
One each per cylinder.
do you have a ck eng light on?