Engine starts/revs but no idle

[GenkiMotors]

Hey guys! First post here. Sorry for the essay but I wanted to give as much info as possible.
I'll start by saying I have used the search on this forum and multiple others, tried everything with no results.

So I have a JDM Zenki Sprinter Trueno, the engine I bought it with was a bigport head and ae92 7 rib bottom end, got it running only to blow a rear main seal on the track due to 2 cracked piston ringlands making my oil pressure shoot sky sky. I was able to limp it back home constantly stopping to fill it with oil. I took a stock 3 rib bigport that ran fine in the car from a Zenki Levin I have as a loaner until I could get the engine rebuilt.

Took the engine apart to find it has the higher compression pistons, HKS 264 8.35 cams on both intake and exhaust, and the head has been ported/polished along with a 0.8mm head gasket. The car also has 4-2-1 headers, hollowed out cat, APEXi exhaust, Cusco MFE ECU, APEXi Super AFC, and I just installed a PLX wideband.

Luckily the crank, bores, rods, everything but the 2 cracked pistons were okay, but I put in new main and rod bearings, new oil seals for everything, and installed a new TRD 0.8mm head gasket, even new O-rings and insulators on the injectors.

After I got everything put back together exactly how I had it, the engine will crank and roughly start, but it will not idle no matter what I try. I restabbed the dizzy and took the cam cover off to confirm the dimples were aligned at 0° TDC, new cap, rotor, plugs, plug wires, even tried with a 2nd dizzy, different coil/igniter, made sure my TPS was correct, checked all the grounds I could find and still no luck. All grounds sanded down, no paint touching any of them, and yes I made sure to get the injector grounds on the intake manifold. The fuel pump is confirmed working, I replaced it when I got the car with an oem spec replacement. Fuel injectors should also be good, as I was just using them with the Levin bigport just a day before I swapped. I even tried 2 different stock ECUs just in case. I can confirm I am getting spark, fuel and compression, all cylinders tested between 225-235psi *edit:may have measured/converted wrong*. The only thing I really changed was an aluminum underdrive pulley kit on the crank and alternator, which I'll try returning to what I had before just in case.

I ran diagnostic mode and the code I'm getting when the engine is off and on is code 10, no starter signal. But the car turns over and will start/rev. I tried a different starter too but same outcome. I checked with a multimeter and found proper voltage at STA(50) on the starter, as well as proper voltage between the STA and E1 terminals on the ECU. When I try to start the car and keep it running by pressing the throttle I also get code 11, but the diagnosis manual states its fine if no code when throttle is released and activates if its pressed.

Please help me! I've been trying for a week with no luck. Thanks in advance!