Originally Posted by BaylorCamaro
Cleans out the engine & intake manifold, basically anywhere where gas goes in the engine. Carbon can build up in the engine over time. A lot of build up will hurt performance, kinda like clogging up an artery. The Seafoam helps to break all that crap up.
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Actually the point of seafoam is that it goes where gas doesn't. Gas doesn't touch the back of the intake valves but seafoam does. That's where the issue comes from.