Diesel car performance problems when the Engine is hot

[Ramatsididi Simon Makole]

My 2005 ISUZU KB 300 turbo diesel, starts normally in the morning but after it warms up it stops responding to the accelerator, and the idle speed increases to 1250 rpm. It has a Bosch VP44 electronically controlled diesel pump.

I have changed the oil and oil filter, fuel filter, and air filter but it still does the same. The Oil level, the coolant level is correct and the fuel does not seem to have any contamination.

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