This isnt all the time, but most of the time it will buck, like bog and then kick in, varying from a little bit(what i would like to think is turbo lag) to mild(enough to make me get off the gas.) I don't stomp on it while the engine is cold, so most of this is near or at operating temp.
I have an '07 WRX TR with almost 52000 miles.
Could this be a boost leak? spark plugs? Stock airbox constriction?
This car has no mods, I bought it less than 1000 miles ago from a suby dealer. I has a mark on the rear seat from a child seat anchor, so I'm pretty sure it was a grocery getter.