Q: O2 sensor or converter, ECM, or harness?

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Two O2 sensors are bad in the codes also saying low flow. The engine has a very rough idle once started to the point of stalling. Once it's moving it really runs quite well with almost no noticeable problem. Only at idol us it noticeable and very noticeable it is.

My car has 159000 miles.
My car has an automatic transmission.

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