You know the three bundled vac lines . . . red,yellow,green. I know the yellow is the smog valve thing, the green is the EGR valve but what does the RED one do? I unhooked it at lunch today and the idle went to crap. It would hang at 1500 rpm and would pull the car around the parking lot, I had to hold my breaks to keep it from accelerating, lol. Anyway I hooked it back up and all is well, but it made me curious