Ka Throttle issue?

Alright i'm stumped i wake up today, at like 6:30am, get in my car and drive about 2 miles down to my girls house. Car is running strong as fuck. I've had no problems with the car since i got it back a few months ago from the shop. I bring my girl to the hospital for an dr appointment. we leave about 20 minutes later and my car is running like shit, i'll be in any gear, maybe a 1/4 throttle and it'll keep pulling then it'll act like i'm not even on the throttle.. and then it'll go back to normal.. it's annoying the fuck out of me.. I noticed while i was at my buddies shop after the hospital, that some how the thick white wire that gets bolted onto the alternator from the fusebox, is burnt to fuck.. I'm confused as to how that can even happen... but my car isn't just running off battery power, because all my interior lights are all bright as they were 5 days ago. Also my car usually idles at like 800rpm, and today it's idling at an even 1000rpms. If anyone has any idea, Please let me know. i'm at my girlfriends house, and i'm not sure if my car is going to even make it home..(Not that i dont mind being here all day(; ) but i'd like to know that if i need to fix it here, i can. Let me know asap please!!!!:gaah: