Jerking shifting gears

Usually dirty transmission fluid/filter (no noises) You can try adding a full bottle of Lucas Oil Transmission Stabilizer fluid...you don't need to drain anything...(could also just be low tranny fluid) Follow the instructions, warm tranny, motor running...add full bottle...manually shift through gears...The cost is about $11. even at Walmart...Hope this helps.

Could be ECU but try changing the transmission oil 1st

This may be normal but you can adjust your driving to reduce the impact. To speed up the warm up process of the catalytic converters, the power train computer holds first gear a little longer than normal. This causes your car to get higher in the rpm range than normal, at part throttle, which causes the hard shift. On your first drive, try NOT to accelerate while the car is in first gear--it won't take long for you to learn how far this is.

Transmissions have so many parts so it's difficult to diagnose. I would have the transmission filter changed first. Usually that is the most common shifting problem. If that doesn't fix the problem it may be a little more costly.

You can try lucas trasmssion fix.

Look at the modulator on the side of the transmission. It's probably gone bad.

seems as if the trans isnt shifting as it should and needs to be checked (could be the shift solenoid not working properly or gears are sticking)

You may have low vacuum pressure which can screw up the fuel regulator as well as shift points. I would start by checking for vacuum at idle, and if low, check for a disconnected, broken or kinked hose.

thottle positioning sensor? if trans has overdrive could be a lock up piece, dont remember name of it. there is a lucas oil product that might help. if it is the overdrive.

column shift or floor shift, If floor probably bulb have to pull out consul for access