fueling issue

[woody.t]

i've finished uni now which means i finally have a spare moment free, so time to sort out all the little niggly things that are wrong with the wagon... bit of a list ..

firstly;
the last 2 times i drove the wagon i got what i suspected was a fuel cut and since havn't driven her as i didn't like the idea of her running lean.. there's a few symptoms which suggest a fueling issue.. i new warlbro 455lph fuel pump in so i'd say it isnt the pump itself but i might chuck the old one back in to rule it out..
- i've hit fuel cut twice.. doesn't happen everytime and only happened at about 7pounds of boost so nothing excessive.. let her sit for a minute and prime the pump once or twice and she's drives as per usual..
-i am repeatedly getting an 02 sensor code.. would a bad fuel mixture set that off?
-i have to prime the fuel pump a few times every now and again to get her to start..
-also when i've been cruising or accelerating and take it out of gear the revs will drop right down and stumble for a moment before it picks back up to normal range
... i was thinking maybe a pressure regulator or something along those lines has packed it in..? suggestions muchly apreciated