I LOVE my Tibby and I have been driving it for a year.. About four months ago it started doing this "jerking thing" while I was driving..The rpms also seemed to go up and down..it is like it would suddenly lose power and then BAM just go really FAST.. Scary.. Well..after a couple days it stopped and everything seemed just fine..NOW, the other day it started again..worse.. then the check engine light came on.. It drives like it 'choking' or spastic.. I have an appointment with the dealer, but ANYONE if you know the problem please let me know..:-( Oh, I have about 28,000 miles on it..Thank you so much in advance..Susan