Need help with stumble and tune for sure.

[PBRstreetgang]

Hi all, I have a hybrid Gen3-4 car that Im having monster troubles getting to run properly. I am by no means a tuner and I am pretty stupid actually, as I bought this car is a great example. So my knowledge of Hp and tuning is rudimentary, so be gentle.
Stumbles at around 2-3k rpms and looks lean? I have a AEM wideband installed, but it keeps failing. Got yet another on order.

2002 C5 Z06 Corvette
Here are the specs on car:
? GM crate LS3 stock engine ? with GM LS2 silver blade throttle body.
? LG 1-7/8? long tube headers, no Cats, only 2 forward AC Delco O2 sensors
? Vararam Intake, with Gen 4 MAF card type sensor
? 525cc FIC injectors.
? Racetronix upgraded fuel pump harness. 70psi at idle.
? LS3 coil packs
? Manual Transmission
? Gen 3 2003 engine wiring harness and 2002 PCM with Racetronix adapters for MAP sensors, throttle body, cam and crank position sensors and knock sensors.
? (8) Fuel injection adapters to use the Gen 3 engine wiring harness. LS6 knock sensors.
? Autoblip installed.
? Lingenfelter trg-002 58x-24x box installed on firewall.
? 18Lb lightweight flywheel
? 93 octane fuel, no additives.
? OEM fuel pump
? No emissions, No A/C, No ABS, No traction control or stabilitrac
? 10% ATI underdrive crankshaft pulley

[SiriusC1024]

Sure about that 70psi fuel pressure? Should be 58. Factory filter/reg means pressure won't change, so it doesn't matter if idle or WOT.

MAP sensor isn't reading correctly...unless you're at 6000ft.

Displacement is wrong.

[edcmat-l1]

MAP linear and offset are still setup for LS1 and it has an LS3 sensor in it. That's problem 1.

The injector data looks incomplete or incorrect. Problem 2.

Both of those are your cornerstone parameters. If they are off everything else is off.

Stopped looking after that.

[PBRstreetgang]

MAP linear and offset are still setup for LS1 and it has an LS3 sensor in it. That's problem 1.

The injector data looks incomplete or incorrect. Problem 2.

Both of those are your cornerstone parameters. If they are off everything else is off.

Stopped looking after that.

Ok excellent I will address those issues and go from there. THANKS!

[SiriusC1024]

What year and make did that LS3 come from?

FIClinic injectors or FIConnection?

You have to have 58psi fuel pressure.

[PBRstreetgang]

FIC clinic injectors. Im considering just putting the stock LS3 injectors back in?

Engine year is unknown as its a GM crate engine 430HP but all stock.

Also I can remove the Racetronix fuel pump uprated wiring harness and bring it back to 58 psi if that helps? And thx for the reply as Im swimming with cinder blocks on here.....

[SiriusC1024]

Racetronix harness and a factory pump? The regulator should still work. Are you certain it's 70psi?

[PBRstreetgang]

Yeah I put a fuel pressure gauge on it and it read 70psi at idle. Maybe a shitty gauge?

[PBRstreetgang]

the racetronix fuel pump haness adds like 1.5 volts to pump...

[SiriusC1024]

Yes I understand, but the regulator should be doing its job. It's a filter/regulator combo. So if you're sure about that 70psi, that it's not just a bad gauge, then change that out.

[PBRstreetgang]

Yeah I see your point....

[Alvin]

That pump harness shouldn't raise pressure really. I'd verify with another gauge.

Fix the map sensor to 128.2 x -0.31