Holden Commodore: Trouble starting engine

We contacted Holden for their response, which is: ``While it is impossible to diagnose a car without sighting it, rough running on start-up and/or hard starting can be caused by many things, including leaking injectors, carbon build-up on the valves, etc. Injectors wear over time and are also subject to deposits from the fuel. Given the age of the vehicle, injector leakage is a possibility. This is not a generic V6 problem. If the injectors are in fact leaking, this is a maintenance item. Injector leakage can be tested by carrying out a pressure test and confirming pressure drop.'' I think this is good advice. Take the car to a fuel-injection specialist and have them check the injectors, and think about having them cleaned.