It sounds like one of the clutches is hanging up. Get it to your Ford dealer and have them do a transmission flush with filter change ASAP. See if they recommend full synthetic fuid for this tranny. It's going to be cheaper that a transmission rebuild.
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.
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.
When you have problem shifting gears, you transmission has a problem.
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.
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.
my transmission is not shifting on my 2005 Ford Taurus what could be the problem
A Dodge Stratus shifting problem might begin because of dirty transmission fluid. This problem could also be caused by damage to the transmission due to wear and tear or low fluid.