I have and SXT model with the 4 cylinder engine. It runs perfect except when going up a hill at part throttle. It then bucks until you either let off the gas or step down into it. Doesn't seem to matter if I'm cruising around town or running on the freeway. Took it to the dealership where we bought it and they said it needs a tune. I bought it not quite a year and a half ago and it was supposedly just tuned when we got it. This is a dodge dealership. My warranty is about to expire and I get the feeling they don't want to mess with it. Anyone have a similar issue or any idea where to start looking?

Scan tool. Codes,pending codes,history codes,live data and TSBs should help ya out. Good luck!