fuel pressure regulator?

[mtperformance]

So I got my car running and I hooked up my fuel pressure gauge and noticed that the pressure drops to about 30psi under WOT, BUT at idle and part throttle it holds 40-41 psi AND if I disconnect the vacuum line it shouts up to 45 at idle and will hold it at WOT all day long. SO my question is can I get away with just plugging the vacuum line or will it eventually destroy the FPR or should I just suck it up and get a after market adj.FPR or is the pump just not pushing enough volume? I wouldnt think the pump was the problem simply because it holds 40+ at WOT when the vacuum line is disconnected, I also have no idea whats in there for a pump (never had it out).

Mods are Ported lt4 heads and intake with 42lb injectors (yeah I know there a little big) cc306 and 58mm TB, LT headers, BLAH BLAH BLAH.

[flippy1974]

it wont hurt anything leave it unhooked as long as its not running bad that way , might want to check a/f like that it will change the tune alittle i never ran a vacum line on mine .

[mtperformance]

Cool thanks

[FORMULA94]

fuel filter? getting enough flow through the line? just a random thought. my truck had a bad filter and it surged when it got bad like i was playing with the throttle.