...isn't working? this has been happening off and on for a lil while but now it seems like the ac is not going to kick back on and the car is idling so rough it feels like it's gonna die when i'm at a stop. Could it be the battery (cause i noticed the dash lights flicker when it was idling real rough) or maybe the spark plugs (and if so, how do I check 'em to tell?) or possible the ac compressor (or whatever it is that runs it)?? please help and use layman's terms/be specific cause I'm kinda mechanically illiterate... Thanks! 