1. All fuses checked-OKup by the heater matrix, you have to take the front trunk lining out, are a few fuses and relays. there is a 30amp one that can cause trouble; but i cant recall if its solely for the heater/ fan or does something else! but its one that not many know about
2. All relays checked-OK (all over the car)
3. There is a spark for both banks
4. The voltage checked for coils and ignition amplifier, maf, throttle positions sensors
5. There is no fuel pump sound while turn the key. I can manually run the pumps with direct +12v. Both pumps are ok, but I don't know if the pumps are kicked together with starter.
6. The spark plugs for right bank seams to be more wet than for left side. Left bank spark colour is perfect. Maybe I was driving only with 4 cylinders, that is why there was no full power, but the engine works really smooth.
What comes to my mind is
1. Crank or camshaft position sensor
2. Fuel pressure sensor (it that is installed on 348).
3. Need to dig some info how to blink the failure codes, maybe that will guide more.