It happens all the time for about a month...
My Stilo is low on power up to about 1800-2000 RPM.
MAF cleaned
MAP replaced
EGR blocked of a year ago
Air filter new,
No fault codes...
No problem when the turbo kicks in... but under that, awful....

unplug MAF, is it the same? if so, change the MAF, if not, start inspecting the I/C and pipe work, air filter housing and boost solenoid valve...

I will try unpluging the MAF... No I/C on 80HP Stilo.. MAP is new...

You say erg is blanked off, just had a similar problem with my car with low power etc similar symptoms which was my Erg sticking, could it be that the blanking plates used have "blown through" so if not fully blanked off now

See link
https://www.fiatforum.com/showthread.php?t=331720

Hm.... Interesting.... could be... I'll check that too!

I've checked the blankig plate. It's ok. We even adjusted the valve clerance, as it probably never been done.. I feel no change... I'll try to chage the maf, even if there is no fault code....