Depending on the mileage I would start by checking fuel pressure at the fuel rail, could very well be early sings that your fuel pump is starting to go.
Keep in mind, I have no idea about the rest of the vehicle maintenance history or milage.
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When working with GEMS vehicles. Never try to locate a misfire by pulling plug leads off - pull the injector connector instead. Otherwise you can blow up the ECU.
Secondly never swap ECUs between vehicles to test them, because both vehicles and ECUs may stop working, and you'll have to have them all reset by a franchised LR dealer (ouch!).