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If you do have a spare VSV for EGR, then try that first....You might have to drive the vehicle a while to confirm there is a difference, with no additional problems.
If no success with VSV for EGR, then try a different O2 sensor .... observing what sort of physical condition you find on the sensor end of the original ... relatively clean, or fouled.
Due to the expense of these parts, you would probably just want to switch out used working parts .... until you are sure that you have solved the problem.
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98 Camry LE, 2.2L, automatic
50k miles, drop in K&N A/F
 recent timing belt, water pump
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