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bingo!

AU DO NO RUN A MAP SENSOR
it is a TMAP sensor

you should not need a new fuel rail

if anything the injectors could be blocked

Don't know much about this here eeleltric fool injection stuff but i did have an old ZL 250 efi same problem was the fuel regulator on the end of fuel rail, don't know if this is relevant for AU but theres my 2cents worth!

actually, have a mate who's had a fuel reg die.

attach a long piece of hose to the reg and suck a little.

a mouth fuel of petrol will give you an answer

spray a can of carby/thottle body cleaner into the intake while holding the revs up round 2grand she'll die a bit this will clean your throttle body, intake runners and ports but after doing this change your plugs as carbon residue kills em, run a bottle of injector cleaner in your fuel tank this will clean fuel lines and injectors will spay properly, doing this may correct your rich running problem, i do it a fair bit when time comes for a tune sometime earlier. i use nulon injector cleaner or a nissan brand and drop that in when refilling every couple of tanks it keeps the injectors cleaner for longer. check for air leaks too.