Weird behavior on low load conditions

Hi everyone!

I need some help with my issue :)

First of all, brief specs (worth mentioned) of my setup:

- stock 3S-GTE 2-gen

- new Tomei FPR

- old stock fuel pump

- old stock (but tested) injectors 430cc

- Haltech Elite 1500

I've swapped my engine to a more fresh one and jumped to Haltech from stock ECU. I did all necessary setup procedures, set default fuel pressure at idle, set ignition timing with lamp, and so on. Then I started to tune a fuel map at idle. The engine works like a kitten, but it was flooded when I started to tune VE at a higher RPM. I tried to adjust VE at the "weird" cell but no luck and now I think that this is a hardware problem. My first thought was "this is the fuel pump" and I've checked the pressure at FPR. It slightly jumps in the range of 0,2 bar (when the engine starts jerking), but it seems ok because of changing vacuum at this point. What I don't understand that how it possible that a broken pump can flood the engine? I expect an opposite behavior rather (engine stalls because of lean AFR and lack of fuel).

These are just my assumptions and I need thoughts from more experienced tuners.

So, what it may be? Fuel pump? FPR? Something else?

I've attached the log and select problem zone on it.

Follow-up question.

Could I mess up the engine tuning by trying to tune a raw VE table with enabled "O2 control" feature?

To the latter part, quite possibly, as the ECU may be trying to correct changes you're making, and vice versa.

I would suggest removing it from the control loop and just using it to monitor the O2 levels in the exhaust so you can manually correct them.

When you have the ECU settings to your satisfaction, you could then re-enable it?

It was pretty tricky and slightly spooky.

I mixed up fuel return and ventilation tubes when I assembled the car. So, the engine was sucking fuel through the return line via a charcoal canister when the throttle was upper than 4.5-5%.

Ewww :)