Infiniti J30 Questions

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This stalling problem has been happening allot. I have parked the car to figure out why. I had an oil change last week and had it inspected. I was told the left catalytic convertor was leaking and would need replacing soon. I have been looking at parts online and found 2.

One does not have an oxygen sensor port, this convertor would match my needs if I don't need the oxygen sensor port according to the autoparts store online. I would also have to buy the gaskets at $10 each. I just don't know if this car needs an oxygen sensor or not. The parts would be less than $200.

The second part has everything and is $262 for the part. My mechanic said he would replace the part for a shop hour at $99 plus tax.

Does the symptom of stalling out, going a short distance and stalling out again...sound like a catalytic convertor issue or something else?

Thank you,

Joy from Florida
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