I have posted a bunch of times about this, mine does the exact same thing at low rpms, especially if I'm stopped on a hill and try to get going. I have changed plugs, wires, cleaned throttle body, checked fuel pressure, etc...and while all made a small difference it still sputters and coughs at low rpms, i'm pretty convinced that's just how the 2.4L is. I've gotten used to revving it before taking off. Others with the 2.4L will tell you the same thing. If you figure it out please let me know because I'm dying to fix it (if it's fixable).