R32 Gt-R Running Rough

[niZmO_Man]

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?

[GTR_JOEY]

Did the Solder fix on the AFM???

Maybe swap the afms for "known" good ones

[niZmO_Man]

All swapped parts are from my car, which runs fine.

Joe - cheers for that but yeah mate, see above.

[anfo2gig]

Vaccum Hose?

[blind_elk]

How old is the battery? Skylines are notorious for misbehaving at the slightest whiff of a crook battery.

[niZmO_Man]

Battery looks pretty new.

Timed the engine properly, it was out one tooth <_< Someone dodgy did the timing belt on it.

Anyways it was running okay, still misfiring (coilpacks maybe), then blew the head gasket haha.

Thanks for your help people.

[Hadouken]

Oh no! How did you manage that?

[niZmO_Man]

Sorry just realised someone replied to this post.

Car over heated but didn't blow the head gasket.

Car's been sold a while ago. Was a dud motor.