Battery slowly died and 3 codes came up

Originally Posted by brandad_1

Changed the battery and volts read 12 and don’t drop, problem is now is I’m still getting codes p010c ,which are for the maf sensors (and I just bought new ones so idk why the code is still being thrown up) and the p0444 which the code reader says is the “evaporative emission system purge control valve circuit open.” Thing is now when I turn the car on sometimes and I try to rev it, it sounds like the engine is about to die and the rpms drop.
It also still idles at 1k rpms and stutters and cant pass 2.5k.