Leaning out / fuel problem

[hpmachine]

I apologize for posting this here. I know I should be posting in the KAT section but I'm in a bind. I'm kind of stuck at my parents house and I've only got tomorrow to fix this issue. I've got a 95 240sx with a turbo KA in it. It's leaning out hard under 3500 rpm. To the point where it is stuttering bad. It starts fine and idles fine but give it some gas and it falls on it's face. I'm watching this happen with my wideband. It started out as a minor problem and got progressively worse. I changed the fuel filter. Nothing. The fuel pump is working correctly. I have a JWT tuned ECU with an AFC piggybacked on it. It's got top feed 740 injectors. I have not changed anything and I have not started looking for electrical gremlins yet. I'm still trying to think of all the most basic stuff first. The fact that this problem got GRADUALLY worse leads me to believe it is a mechanical issue. Possibly an injector problem. The ECU is not giving me any codes. I think tomorrow I'll try to unhook the AFC and see what happens. I'm just asking for advice. Anything I might be overlooking? Thanks in advance. PS - If I get on the throttle and put it in boost it smooths out and runs fine. It builds boost and pulls vacuum perfectly. When it's in boost the afr's are spot on...
Modified by hpmachine at 9:30 PM 2/28/2010

[LOVERboy]

FPR?

idk .. just throwing idea out there

[hpmachine]

No that's working right. Thanks though

[hpmachine]

It threw me the fuel injection code this morning. (76) so here I go...

[hpmachine]

So I poked around with my multitester. Checked the ohms at the injectors. Made sure the plugs were getting power. Found a loose connection. Problem solved. Thank goodness.