2003 Mini Cooper Hesitation?
 

Hello everyone, im new here, and ive been having a problem with my mini since the day i got it. Whenever i come to a complete stop, then hit the gas, it kind of hesitates on the go, maybe i guess you would say bogs down? Ive tried all different kinds of gas, different grades, nothing seems to work, i tried an injector cleaner, still nothing, any ideas? Thanks!