What year is it, have you checked your vacuum line from the booster to the manifold and do you have a service engine light on, if so what are the fault code numbers?
It's a 2000 TD5. I have not checked the Vacuum line from the booster to the manifold (Is the diesel version even set up this way?) No service engine light but I did run diagnostics (Bearmach) and there are no faults.
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