Jaguar Repair Questions? Ask a Mechanic for Answers ASAP
This sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.
1st thing to try is to remove the fuel filler cap and then flick the ignition on whilst listening for the brief ‘buzz’ of the pump
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injector rail (should usually be around 3Bar / 45psi +) and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
You can also get this issue with contaminated fuel , if there’s water or dirt in the tank then either the petrol floats on top of the water or the filter sock on the pump is choked up – so if the other things check out then I’d consider pulling out the fuel pump and cleaning the filter sock
and its also worth trying loosening the fuel filler cap slightly as they have a 1 way valve built in to let air into the tank and so prevent a vacuum. if the valve is stuck the resulting vacuum can stall the fuel pump
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the fueling should adapt quite quickly within a 100 miles or so
I'd measure the fuel pressure if you can as this will show if the pump is OK or not
also worth changing the oil for fresh 5W30 too as the VVT units are very sensitive to the oil cleanliness and weight and also check the connections to the variable inlet actuators on the top of the inlet manifold