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You can't rule out the MAF or the oxygen sensors... quite often, the MAF will foul out and throw a CE code for one of the O2 sensors.
At 80k, you're ripe for a new MAF.
You should also go ahead and replace the other O2 sensors right away... they aren't cheap, but they do need to be of the same age for the computer to accurately read what's coming off the engine. If you don't do this, you'll eventually get another CE light and possible more idle problems from it.
Our cars get expensive when they hit 75k miles.
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