N54: Ran out of gas, now I have misfires under heavy acceleration

As the title says....

I did a stupid and forgot the car was running in the laneway, and let it run completely out of gas. Then of course, all of the hvac, stereo, lights, etc were still on and the battery went flat.

Charged the battery, got gas, got it restarted, everything good....not so much.

Now, whenever I do any heavy acceleration, it get misfires. Light to moderate acceleration is just fine, but as soon as it gets above 4k RPM, misfires again.

If I continue to accelerate hard, the CEL will illuminate and I need to shut the car on and off again to stop the misfiring.

Codes are cylinder misfires.

So, my questions is, what did I $#@! up? Where to start? HPFP? LPFP? Injectors? Plugs?

I don't want to start throwing parts at it until I get a bit of direction.

Thanks for your help!

I can post data logs or specific codes if need be. (Bimmergeeks ProTool)

Cheers.