Originally Posted by
boots
its the main source of vacuum, therefore it will suck the chemicals into the intake much easier, but i know when i worked at firestone we did a fuel system cleaning on a silverado and ended up fouling the plugs... i dont trust that shit
It all depends on if they ran it at a slow easy rate, at around 1500-2000rpm IIRC, however if they just dumped it in and revved the shit out of your car then they obviously just wanted it out of the shop.
That line btw, comes off the brake booster, then joins another line that is connected to the bottom half of the intake mani, it splits right behind/top of the motor.