I am planning on putting new plugs in my XT6 this weekend and possibly turning the idle up a hair..but it has this problem with stumbling at stops....if you dont feather the gas. It will idle all day no problem and let you rev him up ...but this problem only occurs when the car is moving...any ideas??

 

Thanks in Advance

Could be a vacume leak. Try the carb cleaner around the hoses trick and see if the idle changes. My first XT6 had a nasty crack in the intake hose that couldnt be seen unless it was removed and inspected.