So it had the issue before any tuning work ,reminds me of a software or programming glitch a little....definatley not had any tuning work done before you got to it .
How many miles on it ? does it black smoke when you put your foot down ?
Oil level ok .......not overfull at all ?
You say fuel consumption not very good ....how bad ? could be weeping injectors normally get a bit of diesel knock though or heavy smoking on start up aswell .
I cannot see it being the boost ......... boost is just air you need fuel present for the engine to carry on going .
Have you vcds ............ go into accelerator position sensor ....it may show as two tracks .......one track volts start low and go up , the other track start high and goes down or it may just show as accelerator percentage .
With throttle pedal released percentage should be low , with ignition on only press pedal all way down and back the volts or percentage should be a smooth transition up and down .
Will have to have a think on this one .
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