For a while I've notice like misfire between 1200 and 2000 revs

I think it happens after I changed air filter. Maybe coincidence.

I blanked the swirl flaps. I've changed the gaskets on manifold.

It is low on boost according the INPA desired and current values.

No errors on INPA.

Not sure where to look now.

I've ordered vacuum pipes to change all of them but not sure if this will help- hopefully will.

It's 2004 car eu4