Hi all

This vehical came in with lack of power,turbo was noisey and wastegate valve lever was stiff nd not moving fully to its stop,egr diaphram was not holding its vacume so replaced turbo nd egr all control solinoids in good working order turbo pipes vacume pipes good condition,now when road tested still has same lack of power nd same fault code comes up.checked that exhaust was not blocked.noticed on live dater that mass air flow was not reaching desired air flow.
at 3500 rpm
mass air flow(desired)mg/s850
mass air flow(actual)mg/s 450
had air flow metre nd map sensor at hand so tryed them no change.Any one no what i should be checking from here.