[Cobratang]

Alright, quick suggestion for a couple of problems i got. First sometimes, not always, when on the the highway and puting on the headlights, the car will momentarily stall and lose power, but then springs back to life, Also rarely onely when I am parked in one location the car will not idle when I first start it up, It has only happened there, no other places, very weird. So what should I start checking out Alternator, batter, groundings? Thanks for the suggestions.