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I replaced my MAF recently and immediately noticed better throttle response (even after I tried cleaning the old one which helped a little but not that much.)
The real return to smooth running and MPG came when I replaced all 4 of the oxygen sensors about a month later.
Now the car is running beautifully. Once you get past 40K miles it's good to replace all of the above but I would only recommend the Bosch OEM parts, not the cheap ones found on eBay. Here is a case where you get what you pay for and there are plenty of good discount sources apart from the local stealership.
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