setup- crome, 450's 1st set black tops, plx-300 wb, 255 lph(new today), gm 3 bar map,t3/t04b at 10 psi single slam. after fuel pump install no change 14:1 a/f at 6200 rpm put 2nd set 450's today blue tops no change. only other thing i can think of is bad o2 sensor. looking for all and any ideas. tomorrow i am going to check my fuel pressure under boost, and check map sensor wiring. bins for my crome look very similar to those on xenocron.com ****'s bins. tuner added more fuel no change. i'm getting pissed. driving around under 3000rpm is no fun!!