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A couple of possible causes:
1. Gunked up throttle body - take off the intake boot and clean it (brake cleaner is your friend) Also use the brake cleaner on your throttle body - rotate the throttle cam while you are spraying into the throttle body make sure the choke and the mating surfaces are nice and clean. do the same to the air flow sensor - you will be amazed at how much crap gets gunked up in there. After it is clean, you may have to readjust your idle to spec. 800 - 950 RPM at warm idle
2. Poor connection at O2 sensor - check, and clean contacts - DO NOT USE anything containing silicone near the O2 sensor.
3. Bad O2 sensor - replace
4. Small vacuum leak - check your hoses.
hope this helps
AFJuvat
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