Still running lean, need help!

[FatAlbert85]

Ok, I'll start by saying I have a 95 240sx with a recently swapped sr20 redtop. I'm having an issue right now where my car is sputtering. This only happens under boost, not vacuum. Gauge reads 7 lbs. I can drive the car, but if I give it a bit of throttle, all I hear is BRAAAP! Almost like hitting a wall...it's really weird. The only thing I can relate the sound to is it's like hitting a two-step while the car is already in motion. I've already stopped driving the car, so no worries there. Pulled the plugs, snow white. Car is running lean. Already checked the fpr and I have a Walbro 255. Any suggestions what it might be? I'm about to give up.

[S13FASTBACKSR]

dont give up..make sure your voltage going to your fuel pump is not too low. also what is your timing set at and what is your tps voltage at idle? make sure your timing is set correctly at 15degrees btdc and your tps voltage is .45v to .55v at idle. also on the back of your ecu there is a little l.e.d. turn your key on and you will see it come on..start your engine and see if it goes off. if it goes off then your computer is ok..if it stays on you have a bad computer. also make sure your fuel filter is not clogged