If it is a transmission problem, the best thing you can do is have the transmission rebuilt. That will fix the problem and prevent any further damage to the transmission.
If your car behaves as if it's jerking, the problem could be a slippy transmission.
If there is no trouble while shifting, then the problem most likely is with the ignition sequence. This could be caused by bad gasoline, a bad timing assembly or faulty spark plugs/wires.
To stop your transmission from jerking, first ensure that your vehicle has the correct transmission fluid level and quality, as low or dirty fluid can cause shifting issues. Regular maintenance, including checking for worn or damaged components, can also help. If the problem persists, consider having a professional diagnose potential issues with the transmission control module or other internal parts. Additionally, smooth driving habits, such as gradual acceleration and deceleration, can reduce jerking during gear shifts.
clutch or trany problem, possible shifter issue
Not sure if its the same design, but on my 1998 Continental the jerking was caused originally by a few of the individual coils going out. These are found on my vehicle right on the plug that attaches to the spark plug. That is, one sits right on top of each plug. Replacing these (about $65 each as I recall) was pretty simple. Of course, later on a similar jerking occurred which turned out to be the transmission. Ford replaced it. Hopefully, your problem stems only from the mini-ignition coils.
There are a couple of reasons why you car is jerking when you are going below 60. It could be the result of a problem with your transmission, or your fuel pump could be going.
You need to find out what is causing the jerking before replacing parts. A scan of the computer can reveal the problem and most auto parts store will do this for free.
When you have problem shifting gears, you transmission has a problem.
how is shifting in general from even to odd gears- if it's rough, i would say it's the band and it will require rebuild of the tranny...
Because you bought a Buick. They are sometimes known to have this problem, so it is advisable to see a mechanic or...get a new car. That is the only known reason.
Could be a short or the climate control unit is about to be toast.