question number 1--i am losing antifreeze somewhere and cant visibly see any leaks of any kind. i dont know where im losing it. it doesnt leak very much...i put antifreeze in it about a month ago when i changed my radiator but now i need more. anyone have any ideas?

question number 2--my idle is messed up and i get a cel...but i havent checked it. i know the o2 sensor needs to be changed and a friend i bought my car from says that the map sensor i put on was a bad one. the idle will sometimes surge from around 1000-1400 rpms kind of slow...but other times it will idle from 1500-1900 rapidly. so which one is causing the surge...or could it be both of them? just curious cuz im leavin next weekend for IA!!! lol