Guys, have an issue with a friend's GT-R, it runs rough.
Car starts okay, idles okay, won't hold revs properly over 2,000 rpm. Sounds like ignition breakdown. It used a heap of fuel when I drove it to my place. I thought it was AFM issue, did the solder fix no change.
So far I've swapped the following from my GT-R:
AFM
ECU
Ignitor
Coilpacks + spark plugs
CAS
I checked IC piping, all joints look good. Engine sounds okay, turbos are okay as well (makes 12psi no worries).
Timing is good (15deg), cam gears are lined up.
Next step: swap fuel rail and fuel pump. Might be FPR but not sure, didn't notice heaps of black smoke.
Any tips/suggestions/past experiences?