Cylinder 1 misfire help 3rd gen 4runner

Hello everyone,
I have a 1997 Toyota 4runner sr5. Currently I'm having trouble with a cylinder 1 misfire. Starting Jan 2025 my mechanic friend did a head gasket on my vehicle along with underdog race headers and fuel injectors. A week after the job I got a cylinder 1 misfire. Here is what I've changed so far to fix the issue.
Spark plugs denso dual node
Ignition coil packs. Had denso had to buy ena ones off Amazon
NGK Spark plugs wires
Had to replace intake and a few vacuum lines
Did a compression test and got 150 on all 6 cylinders.
Did a leak down test on cylinder 1 and that was good.
Tested the shims of the valves with my friend and the valves are not tight and within spec.

My guess its like a ghost code or computer related. It runs well for the most part. Sometimes it'll idle low. When the code triggers I don't feel much when it happens. But it's getting annoying.

Any advice or other things it might be?
Let me know what y'all have heard

 

Did you swap the #1 injector to see if the misfire moves? Sounds like things would have changed if it was a plug/coil pack/wires.

 

I haven't tried that yet. If it moves then I'll know if it's that injector. I tested the ohms of injector 1,3, and 5 and they were all around 18 I think. I'll give an update when I do try that.

 

I'd bet injector also