You checked "most things"
It seems like erratic trial and error ,
Everything needs to be checked in a methodicly manor Electric fuelpump, mechanical liftpump check the pressure of both with a manometer , check the fuelfilter and inspect for metal debris in filter.... check the fuelpressure regulator and pressure sensor on the fuelrail both on resistance and the connector/wires
If thats all ok check the fuel corrections on the injectors .
Good luck
|