Car was brought to garage with high rev misfire and cutting out on road test. After quick check fuel filter had been replaced by owner (Ford part).

Fault codes present low fuel pressure, High fuel pressure, random nultiple misfires, fuel pressure regulator short to positive, cruise control and temp transmitter. Cleared codes and road tested. During road test car cut out after several miles at normal engine temp, injection time 12 to 200 ms, limped back to garage.

Obviously this is problem but are they controlled by engine ECU or seperate fuel ECU. Can anybody help?

Thanks
(We have fitted secondhand fuel HP/pump and new intank LP, fuel rail sensor and temp sensor)