1998 Mazda Other

Engine Performance problem
1998 Other Mazda Models 6 cyl Wheel Drive Type unknown Automatic 109846 miles

I have a 1998 Mazda Millennia it runs great but my check engine light came on I went to auto zone and they told me what was wrong, the computer read Knock sensor, idle control, and fuel air meetering. They guy couldn't explain to me what any of this was. I need help!
February 28, 2008.

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