today when i started my car in the morning the car reved to 3k and stood there i turned it of cuz i was lit wtf then i started it again and did the same thing i floored it and it whent a little hyer then i turn it of and oppen the hood to see wat was going on i didt notice any thing so i needed to get to work so i unpluged the batery and started the car and everything was fine when i came out of work the same thing happen so when i got home i checked it all i notice was that in the fender well theres a plug were the vacum hoses conect for the brake buster in the plug there little plugs that says ac and othere thing well there one that says b/r i was wondering wat this is could this be causing my problem and if it is why