I am having a problem week. I now have a Vectra 2.2 Automatic which has misfire and power loss. On checking codes I found 1 2 & 4 misfire, also fuel pressure sensor fault. Tested out vehicle and found with foot hard to floor it would go to 5000 rpm and then ease of power. At first it showed fuel pressure sensor. I tested circuit and replaced but fault still there. It now does not come back with any codes. I have also checked for codes in auto gearbox but none present. I have removed exhaust and road tested, reach 4 to 5000 rpm and it holds back. Removed Kat sensor to camera check for brake up of Kat, but all looks ok. Were do I go from here.