Troublesome MAF Sensor Circuit Low code

[woodamsc]

2008 Yaris Sedan, ~190k miles

Bought it at 180k, was running fine for a bit then I started getting cylinder 4 misfire code, and then next day MAF sensor code.

Main symptom was warm starts caused rough idle, driving would usually resolve the rough running.

I just decided to start changing stuff that was likely overdue anyway rather than diagnose
Most of the stuff I changed truly did need changing

1. I changed Sparks + Coils => car drove MUCH better, but codes remained
2. Cleaned MAF Sensor with MAF cleaner. It was absolutely covered in crud. => car drove even better, absolutely mint. Couple days later cylinder 4 misfire. Couple days after that, MAF sensor code returned
3. Cleaned PCV Valve with MAF Cleaner. It was totally gummed up. => Car runs better. Cylinder 4 misfire code has NOT returned, MAF Sensor Circuit Low HAS returned.
4. If I unplug MAF Sensor while car is running in park, car immediately dies.

Should I just cough up $90 for a new MAF sensor? I can't help but feel the sensor is OK sense the car dies when I unplug it. Maybe a grounding issue?

Currently car runs and drives, but I feel like it's in a limp-mode of sorts. It isn't running ROUGH, but it doesn't feel full power.
Car starts rough, like a there's a slight hesitation, and then it rocks around a bit before it sorts itself out.

Since cleaning the MAF + PCV I've driven maybe 200 miles. I was thinking ECM needed time to adjust the fuel trims or something.

If it's not a bad MAF, what would be left to check? A clogged fuel injector?
At this point I need to diagnose rather than keep throwing parts at it haha