Advice please, my 220 cdi S204 Mercedes is not starting very well , engine turns over ok but fails to fire...after a few times it fires up and alls well but after a few miles the power suddenly dips and then picks up again...I connected my diagnostic tool and I'm getting a message saying that the Fuel Rail /System Pressure is too high or too low.... and may be caused by fuel pressure or fuel pump control module or even a faulty pressure sensor ...any advice on what to do next would be much appreciated , thanks.
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