i once had a similar issue with a MGZT V8 after i fitted an exhaust front pipe, after changing plugs checking sensors and spending a long time trying things it ended up being an issue with the fuel pump, although the pump was working perfectly it lost pressure as a clip came lose, the problem is as the pump was inside the tank it just leaked back into the tank, i know it sounds strange but it might be worth a look, i am not even 100% sure the set up is the same. If it is , just remove the pump and check the filter housing is still properly connected to the rest of the unit, i may be way off with this one but its worth a look .
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