So when I am at lights or stopped and my fans turn on my rpms flutuate between 1000 and 200 or so and every once in a while my batt light flashes. The cars done this since I have got it although I found a disconneted vac line and it,got rid of the batt light issue for a while but now its back. When the fans turn on my lights dim for a a second also, but the thing is I had the charging system checked and the altetnator and batt came up as fine. What is the issue? Any help appreciated, and I cant find any loose vac lines so cant see it being that.