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You really need to baseline this car or you will spend endless hours chasing down issues. At that mileage and with those codes I would recommend changing the following:

_The Fuel Filter
_Both MAF sensors
_Both Exhaust Cam Position Sensors*
_Both Pre-Cat O2 Sensors

Consider this a good starting point. Best of Luck.

*I was also getting a b2 (bad cat) until I changed these.
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