On my fiances 06 GP base, from time to time when sitting at a stoplight, when you go to take off from a stop it "bangs" before moving. Best way I can describe it is its like theres some slack in the trans somewhere and when you accellerate from a stop it winds back up and jerks into forward motion. Not so hard that it rocks the car but hard enough to make a noise and to not want it to happen much longer. I know theres a search button, and I have searched but found no definitive answers. Just wondering what people know about this. Im not sure what it could be. Thanks in advance.