The brake booster line is a lot simpler. I guess you should open the throttle plate if you pour it down in the throttle body... but you know, even it is just for five minutes, the idea of dirty air being sucked to my engine through the throttle body scares me... like with a gust of wind a leaf flies to the throttle body... ehm. Besides the throttle body is horizontal, not quite ideal for pouring.
Just remove the brake booster line and let Seafoam be sucked in slowly. Make sure you are in well ventillated area.
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