A 2000 Dodge Neon will run but not accelerate over 15 mph if the transmission governor is stuck, it is not receiving enough fuel, or the ignition timing is substantially off. Hooking an OBDII code reader to vehicle will help narrow down the cause.
my 2001 neon has a chip key well iahev a 2001 dodge neon and mine does have a chip ignition. you would have to go to the dealer to get it made. If you did get a copy of the key made anywhere else it would only work to open the door it wouldn't work to start the car.
There is no difference besides the badge on the car. I had a 2001 Plymouth neon and now have a 2002 dodge neon and the only difference between the 2 is the badges and the grill. and the grill changed with the 2002 model.