Hey mate, sounds like it might be a fuel delivery issue. Do the simple things first, change the fuel filter, check for air leaks, bad joins and damaged lines. You need an OBD2 tool like an ELM327 (10 bucks on ebay) to monitor the fuel rail pressure and see if there's anything obvious there. Also scan the engine module and see if there is any fault codes. If all that seems ok, I'd be thinking a fuel injector could be bad. This will be a bit more involved but maybe start will inspecting wire harnesses, wires, return lines etc. You'd then want to connect an oscilloscope across each injector to monitor the firing pulse for each. A bleed-back test on each injector could also identify a problematic injector.
If this stuff is out of your league, you need to take it to a proper diesel shop. The local mechanic wont be up to it.
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