Hi Guys. OK great so I have booked in to just get the entire bank of injectors replaced. If it is of any relevance, the engine seems to be making an erratic flick/flap noise at the front end of the engine when idling as well. As if something is loose around there. This is definitely a new noise probably ongoing since the rough idling began. Any other common issues or ideas that could cause this?

 

Keep the old injectors. They can be rebuilt (mostly means cleaning) and kept for spares or sold off for a % of new. That's what your mechanic is likely to do.