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I have the exact same issue for Both AFR error (50120 Air Fuel Ratio) and EQ Ratio error. Very curious what the fix is. I'll post back here if I find out.

I see what you are doing here, will load today. I really appreciate you taking the time, I obviously am a newbie when it comes to this and have gone down a rabbit hole of information that I didn't...

ok, so it does run better - no longer stalls but still has a lot to be desired. Idle is very rough. Appreciate your help with this.
Attached is the cold start run from today. 144332

Thank you! I will check this out over the weekend and follow back up!

Everything is pulled from the same corvette that was in a rear end collision, ECM, Engine, harness etc. No modifications have been made to engine.

I can see the confusion, intake manifold is stock, it's just the filter/intake to the throttle body that was replace. Manifold etc has never been pulled off engine. tune is a starting tune using the...

full exhaust system, car is drivable.

This is a stock engine - LS Swap. Aftermarket intake and headers/exhaust are the only things not stock. 4l80e transmission.
added Virtual Volumetric Efficiency and run.144293

I am at a loss and was hoping I could reach out for ideas, currently when I cold start it takes multiple starts to get the engine warm enough to run as its running unburnt fuel odor is strong. It...

UPDATE! This is exciting for me. Hooked all wiring back up and no more trouble codes! All values look good, even the throttle body opens and closes now. Engine is completely out so need to do some...

I am about to go out now so can't validate for a few hours but I think you may have solved my problem... Disconnected everything - APP sensor 2 Signal is showing 5V disconnected...Traced it back to...

Thank you, Saved me some time. I am not sure why but cannot insert the picture, confirmed though this is the same wiring.

I will definitely run through them all again. Have compared to multiple wiring diagrams and all seem to be wired correctly.

Agree- APP sensor 2 showing > 4 Volts. I swapped the pedal with a new one and got the same result.

Thank you for your reply, I am attaching logs, not sure if I pulled correctly as it is my first time pulling them.
Best I can tell in all my testing has been this is what is causing it -...

I have been stuck on this one for a while now and can't seem to make sense of it at all. Have been reading up on multiple threads with no avail and thought I would take a shot here.

engine runs...