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People always seem to suggest just pouring sea foam down into the brake booster hose even though they probably don't have any idea as to where it actually leads to.
When disasembling a 4a-fe intake I found that the brake booster vacuum line leads directly to cylinder 1 and only cylinder 1. You would be pouring the whole dose into a single cylinder. Waste of time and money and possibly an engine. Since your pouring 4x as much fluid as you think into a single cylinder.
This same situation could be true for many motors. Unless you know first hand, don't use a vacuum hose!
Use a spray bottle and spray the sea foam into throttle body as the car idles to evenly distribute it among all the cylinders.
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