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When I fed my intake seafoam on my jeep, I used a mist bottle and sprayed it directly into the TB. letting the engine suck it in with the air, and some what atomizing it as it was sucked in.
Good point. Using seafoam on my motor still makes me nervous even though people have good results with it. I guess the whole "if it aint broke, dont fix it" comes to mind. By spraying it in to the TB though, I imagine it to help clean the carbon out of the intake manifold alot better than going through a vacuum line.