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Jaguar XJ losing power

Jaguar Jaguar Advice Jaguar XJ8 Jaguar XJ8 Advice Jaguar XJ8 1998
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My 1998 Jaguar XJ8 loses power when I accelerate fast, but it goes ok on when I accelerate slowly. What could be wrong?

It sounds like it is running out of fuel. Have the fuel-injectors and throttle body cleaned.

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