I have just bought a second hand kia sedona 2.9 TDi manual, and when I change from 2nd to third gear and reach 3000 revs, I get a noise until I change up to third gear, it happens in this gear I think because I am accelerating most in this gear, and is really the only gear that I reach 3000 revs in, if I change up before that, I dont have the speed I need. Is there something wrong with this car and needs to be returned to the dealer, or is this just something that happens with this model of car.