NHTSA Complaint #11681862 — 2019 NISSAN ALTIMA

I have a 2019 Nissan Altima SR 2.5. I have currently had the car for about 3 or 4 years now. For most of the time I have had the car, the check engine light stays on. I have had it tested, and it always states that it is the Mass Air Flow Sensor. When sitting in park idling, it will "malfunction" and state that the engine is reducing power. During this, the automatic emergency brake warning light and the VDC light will come on. It's rare that it happens while I am driving but it has happened. I recently had the vehicle checked again and again it stated that the Mass Air Flow Sensor and the Grille Shutter Actuator were throwing codes along with some other minor items. I purchased the MAFS and replaced it in hope that this would correct a lot of the idling issues, however after a few days of driving the vehicle, it again has started to malfunction and idle harshly. I do know it typically happens in the morning recently, but I was also having issues with my battery draining for no reason. This car is a certified lemon. I currently don't know what to do, as this sight states I have no unrepaired recalls for this vehicle, and I currently owe too much money to trade it in.