high fuel pressure

Car: Brera 2.2JTS Check engine light is on with P1670 code, rough idle when warm, could randomly go worse and stall. Giving gas sometimes make it calmer for a bit. The fuel rail pressure fluctuates fast between 2400-3600Kpa. My local mechanic suspected the high fuel pressure regulator and...

my 156 jtd keeps stalling with reving around the 3-4000 rev mark.. i took it to my local mechanic for a diagnostic check, and im told the fault is showing as fuel pressure too high. im told this could mean a new fuel pump as he tried changing the fuel filter and checking the fuel lines to no...