Here is a list of things to check:
Check and fix any exhaust leaks
Check for wiring problems (shorted, frayed wires)
Check the frequency and amplitude of the oxygen sensor
Check for a deteriorating / contaminated oxygen sensor, replace if necessary
Check for inlet air leaks and vacuum line leaks
Check the MAF sensor for proper operation
The third item is best done with a very good scan tool, and someone who knows the proper values. Your $20 scanner will not do it.
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