It sounds like you are having a problem only during the open loop mode. Which is when the car is cold and the O2 sensors have not warmed up to take control of the air/fuel mixture. But the sensors still do read the hydrocarbons percentage in the exhaust. Now until you get some codes pulled off of your computer I cant help you any further. But be careful because if you are running lean you can burn a piston and if you are running rich you can get a significant amount of carbon build up or burn up the catalytic converters.
You can get the codes checked at autozone for free. IT wont tell you exactly what wrong, but I will get you where to start looking. Let me know what codes you get.
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