Fuel injection systems are complex and hard to diagnose, and the same goes for coils and spark plug wires. If this vehicle is not under warranty, take it to a mechanic that has expertise in this particular make/model. We highly recommend you get a second opinion if the first mechanic suggests that you need a new fuel injection system. Very often the problem is not the fuel injection system itself but, rather one of its sensors. A skilled mechanic will be able to determine if all the sensors are working properly