Had my GTV V6 (year 2000) for over 8 years now and it’s always been great. Ran on Shell V Power but then local Shell station changed to Esso so now use their premium unleaded with some Tesco Momentum. Last year started having fuel starvation/power loss at high revs. Was intermittent and sometimes would clear quickly, sometimes had to pull over and let engine idle before would run smoothly again. Mechanic said it was fuel pump, so replaced with new Bosch fuel pump. Still got same issue however, and it’s getting worse and more frequent. Now getting reduced power at lower revs with fluctuation in power delivery, mid range fine but over 5k revs it almost always loses power. Once this has ‘kicked in’ I lose power throughout rev range and it’s almost like coasting. I either have to select 6th gear and reduce revs right down or idle the engine, and eventually it picks up and I’m back to full power. Assumed this might be bits of old fuel pump in system so ran a bottle of Redex through it but doesn’t seem to have made any difference. Any thoughts? I’m going to take it to Alfa specialist but thought I’d see if anyone had experienced this issue with a V6 Busso engine.