Engine won’t start

[Finto_GX]

Hi guys ,
Have recently tucked and flushed my engine bay, I’m running itbs but waiting on parts so I put the standard throttle and intake on just to start it . I had trimmed my loom down to suit itbs so removed maf and idle up wiring -car runs once petrol is poured into intake:

my questions are :
I rewired Maf and idle up directly up to the ecu , I have spark and fuel pressure but no fuel out of injectors .

does any one know exactly we’re my maf and idle up wires should go and do yous reckon Nats is stopping my injectors from working

also have a plug I cut the wires out of (about 2years ago) haven’t a clue what they do or what they were for (see picture)

 

[Finto_GX]

I have 12v+ live at injectors during cranking . Sometimes it goes to 2v and when I disconnect battery it goes back to 12v . If I connect my earth to negative on injectors and to engine block for continuity it beeps when ignition turned of just once every time