Misfire like fuel cut under throttle - Stumped!

[TwIzTeD_3kGt]

Mod shortlist: 19T, 550cc, AFPR, Supra Pump, FlashECU/Chrome, Montero MAF

It idles fine, but rich, like 11-12 AFR after closed loop. 15 AFR in the first 10-20 seconds of running.

Accelerates normal at first when not boosting, then when boosting it breaks up bad. The more it's driven, the worse the problem seems to get, to the point where it breaks up with any kind of throttle, boost or not.

Pressure tested, found a few major leaks, and fixing them had absolutely no effect on the problem.

Checked the front 3 plugs, and they look good.

Fuel pressure is normal. AFPR is functioning normal, but there is a miniscule amount of fuel getting to the vacuum part of it. MAF readings appear normal based on experience.

While I had it idling for about 20 minutes, I watched the low fuel trims go from 2% to +10-12% and hold there. This was after fixing boost leaks.

Today I found all 4 O2 sensors are reading 0v or close to it, and have no reaction to revving the engine. They only react to unplugging them, which makes them go from .03v to .01v.

Is it possible I have 4 bad O2 sensors at once?? Or maybe I tuned with some failing O2's and didn't notice? Could these cause a fuel cut like misfire??

Would driving in open-loop test that theory?

[CoopKill]

What plugs, and what gap?

[TwIzTeD_3kGt]

What plugs, and what gap?

I don't remember which plugs I put in there last, gap is .025".

This problem started on it's own without me changing anything, so nothing is misrouted.

[futurevr4man]

You sure you don't have some kind of hose routed incorrectly around the intake bubble? If you were boosting unmetered air and just flat didn't know it (aka it's not leaking "out"), it could definitely cause a fuel cut like symptom.

[DK77]

I've had similar issues and this weekend my crank sensor completely failed. I'm not sure if they are related but it's possible. My best theory on my car though has been that my Kenne Bell Boost-A-Spark was failing/shorting somewhere. My problem has been very inconsistent though, sometimes it worked perfectly, other times it didn't.

[Unlogic]

It sounds very odd that all of your O2 sensors would stop working simultaneously. Sound like an electrical problem to me. What brand of Chrome ECU do you have?

[futurevr4man]

Without physically changing anything, or you mean literally, no tuning changes or anything either? Like if you tried to engage NLTS or something maybe your clutch pedal sensor is bad for instance causing your car to freak out. I pulled that out of my butt, so that may not make sense, but I'm trying to look at all possibilities

[TwIzTeD_3kGt]

I tried to disable closed loop by disabling bit 4 in peripheries, now it just cranks and doesn't start. Anyone know the input code to reenable it?

[Chris@Rvengeperformance]

I tried to disable closed loop by disabling bit 4 in peripheries, now it just cranks and doesn't start. Anyone know the input code to reenable it?

Can you have ecuflash do a compare against what's in the ecu to confirm the flash was succesful?

[TwIzTeD_3kGt]

Jester ecu.

Didn't change anything at all. This is the first time I hooked up the laptop since 2013. It ran fine, and then this issue just started in the middle of a drive.