What do you mean "jerking"? That could be taken a lot of ways. Different models have different behaviors. If you mean it doesn’t drive like you’re floating down the road on a carpet, that’s one thing. If it stalls and leaves you stranded in the middle of an intersection, or bucks and screeches, or doesn’t start, has power surges, or other problems, you could be looking at a real problem.

If it is a behavior that 2 other Chrysler (not "crystler" by the way) 300 owners have experienced, it sounds to me like it isn’t abnormal. A lot of things can cause mild jerking in the powertrain, among them climate control cycling on and off, torque converter lockup, transmission shifting, and others. Also, some cars exhibit certain behavior under very specific conditions, and you may simply operate under speed and traffic conditions in which the condition shows up frequently.

Since you say it jerks like crazy, it shouldn’t be hard to demonstrate the problem to the service manager or tech. Just take them for a ride, they will probably be happy to go along, since at least then they have some evidence of the problem. Otherwise all they have is the computer, or any very obvious powertrain faults. Now, they ALSO could feel the behavior and say that it is completely normal for certain model 300 series cars and that they can’t do anything about it. Because, that could be the case. Again, we’re dealing with what is "normal" and what is a "problem". Some cars are simply not as smooth as others are, even very expensive cars sometimes have weird oddities. I have weird idle hunting (up/down slightly) problems in a new $55,000 Audi, and a seven year old $32k Lexus that has a rock-solid idle. I am not chasing the dealer to fix the slightly erratic idle on the Audi, because I’ve had three other cars of the same make, that have exhibited very similar behavior. It may seem like a problem to some people, but I’m sure the dealer would say that it is normal… because in my experience it is normal. Not desirable. Normal.

Just remember, if it isn’t a defect, but you just don’t like how it drives, how it shifts, or something else about the car, that’s not going to get the manufacturer to buy it back from you, no matter what. It pretty much has to be a defect (whether they can fix it or otherwise). Make them aware of the defect and see where it goes. You can try another dealer, too, just to see what happens. Usually they’ll get higher-ups involved if you are persistent enough.