R32 Gtr Cutting Out Issue

[Tabs]

hey skyliners

after a fun and solid 8,000kms of giving my GTR absolute death I have came across my first issue, seems like wiring or a sensor

its intermittent fault some times it runs fine some time I almost cant take off from the lights

it feel like the fuel is being completely cut ( may also be the whole ignition ) most the time it happens when starting off in 1st gear , but the old time is happens crusing at 80 \ 100kms, its only under vacuum it is fine when boosting. I have noticed the black rich stain on rear bumper I used to get has almost gone to me it saying Im running leaner??? its seem to idle fine when im experiencing this issue

I tested air flow meters ( when fault was occurring ) and they tested fine, tried to wiggle plug and wires going to afm to see if was that and still tested good, the single turbo was close to the loom and would of cooked the wiring but the plastic doesn't appear to be melted at all, - I put a turbo beanie on it which has helped a lot from keeping the heat to the wires going to afm etc tried a couple of different cas's and adjusting timing - + 5 degree but no difference , Inspect the 044 I put into the tank and its still solid in there and everything looks fine, I went over all the hose clamps I could see to check for air leaks but all appeared tight as can be, a couple of months ago I set tps to correct setting ( was way out) when to check ecu fault code and learnt the pfc doesn't have screw thingy and a led. I check fuel pressure and its good ( have checked when fault is occurring tho)

im getting my to4z and link ecu that sitting around in nz for my gtr over there and going to get it tuned with a map sensor and get cam gears adjusted in a couple of weeks.

I have been neglecting to drive it lately cause of concern its running lean! to me its an afm or fuel pump issue relay ( can a o44 run ok of standard wiring and relays, hidden vacuum leak, I think its odd how it idles ok and doesn't cut out under boost,

any suggestion would be greatly appreciated