89 2.8L Pontiac Firebird v6

Ok, this is a fun one.. well... for everyone watching me suffer that is. I bought the car not to long ago (1 year... so pretty long ago i guess..ANYWAYS)
I can't get it running! I've been wrestling with it for months... It had alot of issues.. I've changed the distributor, ignition coil, plug wires, and plugs... So.. the ignition system should be peachy. When I spray starter fluid into the intake it starts but goes right back off.. So it would be a fuel issue right?.. Only thing is.. I've changed the injectors, fuel pump, and fuel filter... It's getting 45-55 psi on prime.. The car ran when I had the cold start injector still plugged in {I unplugged it because, it wouldn't actually shut off.. fun.. I know.. It was constantly flooding my cylinders} It ran... very rough.. but it ran!.. It does give me a code.. 34.. which is for the Maf i'm pretty sure... Here's what i'm thinking.. I've tested the maf and it seemed functional... Should I just buy a new one?.. OR.. Is the car supposed to be getting that much psi? Is my fuel pressure regulator the issue? Like i said it runs {well acts like it will} when i spray starter fluid.. I just don't know.. HELPPP {IF YOU NEED MORE INFO.. I GOTCHA.. LET ME KNOWWW}

Code 34 is for maf on 3.3 and 3.8, yours is map sensor signal voltage low, and running fuel pressure is 34 to 47 p.s.i.