1988 Pontiac Firebird Engine has no go

Engine Performance problem
1988 Pontiac Firebird V8 Two Wheel Drive Automatic ?????? miles

I have a 88 Firebird Formula with a 5.0L TPI. Here is what I have expreienced and tried....
I can drive at a normal pace and everything is fine but if i want to give any kind of acceleration above normal driving it bogs bad and doesnt do much of anything. and if i hold it to the floor it just kinda craps out and will surge just a little, doesnt die though. I was getting a light with codes 32,33,34,45. I took the MAF? off and cleaned it out and repaired the pigtail. Its not throwing a light and I havent checked for codes since but no change in performance.


Part II
ok so I went in and replaced a bunch of deteriorating vacuum lines, not quite all of them but 90%. I got the bad ones replaced anyway. I also went in and clean the MAF? (whats inline on the intake) and repaired its pigtail. it still acts the same, so I will include a vid just to kinda clarify what I mean its doing. btw after cleaning the MAF i only get a check engine light 20-30% of the time

after the initial rev, im hlding the pedal to the point where i should be revving quite a bit higher but it just drops to about 22-2500..... It acts the same when driving allowing me to accelerate just above grandma style.


http://i301.photobucket.com/player.swf?fil...yd/112_5859.flv

okie so, based on the advice of someone else I replaced the TPS along with the fuel filter. For a brief period (a matter of 45 seconds) after installing fuel filter and TPS (i had forgotten to plug the IAC back in) the car wasnt 100% but there was a huge difference.... after that initial period it ran like crap and died. I then remember that I had forgotten to plug the IAC in and fixed that... now after doing that and adjusting the TPS to .55v, I am back at square one, runs exactly the way it did before I started

I'm throwing no codes at all now, still having the same issue. I tested fuel pressure on the rail and at idle it was holding within specs but when i gave it a rev the fuel pressure dropped to 10 or less... I then replaced the fuel pressure regulator... no change.