I have a 2003 Nissan Murano, and following a complete tune-up by a local mechanic, I am having a slight accelaration problem. Once the car is warmed up, when I accelarate from a dead stop, if I don't give it enough gas, the engine has a slight hesitation. Once I am above 2000 rpm and cruising along, I can accelerate without any problem. I was told by the mechanic that the on-board computer may need to be "re-flashed," since power was cut off to the system during the tune-up. He said that this would have to be dome at a Nissan dealer. Any thoughts?