Take it back to the dealer! Now! Tell them exchange for one with a diesel pedal /w3tcompact/icons/wink.gif
Seriously though... Check the linkage for bends. If it is tweaked slightly, it would cause that. Also, check the whole linkage path to make sure it isn't rubbing a piece of sheetmetal, or engine, or frame. Check each linkage connection point to ensure it is clean, and that bushings are clean and are still there, if applicable.
One thing to look at too, is to make sure all the linkage is clean. If you spray lube on it(ie wd40, ect), it will attract dirt and stuff, which will cause it to jam up again.
RobertN in Shingle Springs Calif