mil light is off ....what does that mean service engine light comes on

i have a pontiac grand am 2000 the other the day the service engine light came on then goes off , now it stays on rileys auto ran a scanner on it and the only thing that showed .. was that the mil was off. so what does that mean. id like to have some idea beofre i bring it in to the shop. the car doesnt seem to have a good pick up. i have not had a tune up in awhile could that have anything to do with it. does the mil have anything to do with the amount of oxygen flowing threw the car and is this some thing o can replace myself. thanks for your help odie

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odie via CarKB.com
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