Engine performance problem

Thanks for the reply hmac300, I will get the pressure on pump checked, I had been a mechanic for 30 years, straight from school, have now retired, I have worked on perkins engines in the mid 60s, I thought I would buy a diesel for economy? Oh dear, every thing you touch is expensive, and diagnosing problems is not straight forward, the previouse owner had a new turbo and water pump fitted.I have changed glo plugs, egr valve, fuel pipe + syphon, new battery, fuel filter, special fuel additive to clear sludge from inlet manifold. Oil + filter changed, took injectors out soaked in carb clean over night, wiped clean + refitted. Just waiting for ign card + reader to arrive.I am telling you this in case it rings any more bells, if so please get in touch, les