Sluggish td6

Hi all.
My TD6 is sluggish on pulling away for about a minute then gets up and goes.
I've serviced it along with the crankcase breather filter and a performance air filter.
6 x Bosch refurbished injectors from Bosch.
1 x Mass air flow sensor.
1 x map sensor.
But it is still the same, unless I disconnect the Maf sensor plug and she will pull away as she should.

Any help would be helpful.

Thanks Gary