Gooday, I'm oats from Botswana owning an x350 jaguar v6 and my problem here is performance..I diagonised the cat and I'm getting code P0171 and I'm not sure if it's the fuel filter,flow plugs or something else...it does take off sometimes it does and when it reaches a certain stage it doesn't and the refs will be fluctuating..what might be the cause

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Xj6 x350

vin