My service engine light keeps coming on, for the last month or soo it has came on like 5 times. It only seems to come on when it is cold outside. Does anyone know why this is... i went to autozone and they said the code was for a/f something or another. Usually i take off the negative battery overnight and it goes away for a week or soo..
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You could have a problem with one of your sensors. If the problem keeps coming back, you should address it.

Is your car getting up to normal operating temps? (temperature reads about 1/2 way between L and H?)

 

Get an OBDII reader and see what the code is. You can get a cheap reader at AutoZone for about $100. It can read the codes, which will help you diagnose the problem, and it can also erase them, so you SES light is not glaring at you