Guys sorry if I open the post, I have a alfa gt 150cv edc16c8 with the same problem, I tried to change the map but it fails the same... the variable geometry cold-works well I also did the manual activation and it makes the whole race... the problem manifests itself with the gears lughe type, the fourth... what could it be?
I personally have fixed by disassembling the turbo, the snail on the discharge side and cleaning the geometry of the turbo
Check the wiring up allacentralina
The drive is mapped, but have started to us after several months, which always has the same map...then find the map. Leo_sg the map sensor you say? Because I already tried to change, and should always be faulty.
Clean up the geometry variable is the one that does not flow well.
the same problem ank'io