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Open up the fuel filter and see is there are any shiny bits that could be metal/metallic. Get the fuel lines pressure/vacuum checked to see if any of the rubber fuel tubes are starting to breakdown.
As for the sensors, injectors and anything electrical make sure that the connections are clean and give a low resistance connection.
Go for the easy/cheap things first before changing parts
Edit am trying to help you as life is too short.
lynx
They've been given a cursory check by the guy who did the pre-purchase inspection and then my regular mechanic had a quick look to make sure it wasn't a death trap but nothing more than that, if it ain't broke type stuff.
The 150,000km service is due, I'll get him to give the fuel system a thorough going over, change the fuel filter, plugs, etc. Plugs are due anyway. It's gotta be one of plugs, injectors, fuel filter, MAF or O² sensor according to my exhaustive internet research.