Help me figure out what part is failing.

[Keyan]

So I've always had this issue but it's been getting worse recently so I thought I would get our hive minds to take a look at it.

Important mods:
MAFT gen 1
Ls1 maf in oem location
Chrome ecu
Walbro 400
Hotwired pump
Fuellab fpr
Stock injectors


The problem is as follows.
When driving, at least once every drive cycle, I will be cruising down the road at normal AFRs, when suddenly the car will loose all power and my wideband will display full lean. Gas input barely does anything. After about almost a second of it, suddenly the car will slam back into power and AFRs will drop to like 11.5, then do the cycle again 2 or 3 more times. After the car's "event" it will clean right back up and I'll be cruising at normal AFRs again.

Also it has this issue, where right after I change gears and get back into the pedal (lightly) the car will exhibit a similar no-power where the AFRs will chill or hang around 17 before my car goes "Oh yeah it needs more fuel". This does not happen all the time, but is most noticeable going into 2nd and 3rd.

The vehicle also makes no power until about 3000 rpm at which point a switch will feel like it got flipped and my car will lurch forward with power. Dropping below 3 grand and accelerating replicates the issue consistently.


What I've done to attempt to figure this out:

It originally started when I had it with a 3.5" blow through maf. I converted back to stock draw through with a 3.75 maf. No change.
I tried cranking the fuel up on the MAFT. No change.
I tried swapping my evo injectors for my stock ones (that are known to be good). No change.
I tried swapping out an old used Walbro 255 for a new Walbro 400. No change.

I tried turning off short term fuel trims and long term fuel trims in Chrome - - that made a change. Both issues completely disappeared. The car will run leaner than stoich at warmed up idle and cruise, but if I run through the process to replicate the lean-no-power, it's completely gone and instead AFRs react as they should for a problem-free car.

I can't figure out how to determine if the issue is my chrome ecu, my MAFT, or my air fuel sensors.

Not sure what my next step in diagnosis would be.