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You should definately use the search button next time. Type in seafoam and you will get a lot of details answers.
But here it is...
To pour seafoam into your engine. Yes, unplug the brake booster hose and pour the seafoam in. If your engine want to die then have someone play with the throttle to keep the idle up and running. The engine shut off because you didn't pour it in fast enough. As soon as you unplug it, put your thumb over it to keep the engine from dying.
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