This is my 7th turbo car.Seemed to be fine.With an occasional dying on decel after a full throttle blast.So I thought I would just check all settings and tune it.I threw my fuel pressure gauge on it and found the pressure at 20 psi with vacuum line off.So i turned it up to 42.5 psi,and it ran terrible.I checked tps setting,o2 sensor values,blm,I did find egr vacuum line off to egr.Never ran into a problem like this before.Any help? If you need any other info I can get it.Any help would be appreciated.