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Isuzu D-MAX 2004: Hard starting and loss of power

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I have a 2004 Isuzu Adventure 3.0-litre turbo-diesel. It is suffering from hard starting and gradual loss of power. I have taken it to several dealers and they say there is nothing wrong. Can you help me? Some parameters of the systems would be a great help. EGR, Fuel Pressure, testing computer, etc.

It could be a fuel supply problem, so I would suggest checking the fuel pump.

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