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P1115 ,p1119- O2 sensor heating below threshold.
Bad O2 sensors, wrong sensors for your car model, mis-wired sensors, damaged wire harness. You currently have no working O2 sensors so no monitoring of your mixture. This can damage your cats and potentially your engine over time. Probably the cause for misfire also as the DME is blindly attempting to control mixture.

Also there are several different MAF sensors so you would be wise to confirm the part # for the one you installed and make sure it is the right one for your car year/model.

Time to knuckle down and retrace all recent repairs to see where things went sideways. Good luck!