Check Engine Light

#1
Three weeks ago, I had a Catalytic Converter and Oxygen Sensor replaced on the 2000 Corolla. Therefore, the Check Engine Light came on. After I paid a total of $448 to a mechanic to replace it; it's been a total nightmare. When I pull from the stoplight/stop sign, the car acts if it wants to hesitate or wants to cut off. I went to Auto Zone to do a check to see what was the problem. Claiming Faulty Heated Oxygen Sensor (bank 1 sensor 1) circuit slow response, EFI relay fault, poor electrical connection. I am now completely at wits end; because it will eventually shut down. Right now, I am not financially ready to get a new car. Any suggestions?:mad::mad::mad:
 
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