Fuel System leaning out.

[jabartram]

I have an issue, a little back ground info. as most of you know i auto cross the shit out of my Alero, well the races have been cancelled for the past 4 months and the car has been sitting for the last 7 months. i didn't drive it at all for 3 months except in and out of the garage and it had very little gas in the tank. i have recently started driving it again at least on the weekends and to work sometimes just to keep the cobwebs out. auto cross should be running again in January, but now i have severe lean-out, fuel pressure is running 45psi at idle 55 at throttle, i bumped up the fuel pressure the 50 psi at idle, 60 at throttle, replaced the fuel filter, i have increased the injector output twice and im still having the same issue, it acts as if it is running of gas, it has literally no power and im getting lean codes. so im at a loss, i don't think its the fuel pump its one of the high pressure pumps from milzy, any other ideas?