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You can burn your valves and combustion chamber, detonate, and a myriad of other problems that translate to a long, slow, painful death for your car.
What makes you think you're running rich or lean? What do you have done? From your sig, I'm guessing nothing major.
There are a million air/fuel ratio controllers out there, but in your case (since no major modifications have been done), I'm guessing you have something needing to be repaired, if the a/f is off.
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