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If you had a vacuum hose unhooked throw away any test results. I can tell you from experience that the seafoam treatment of the engine will make it very hard to start, when I did my Escort it took quite a bit of cranking and it threw a trouble code for a misfire. I never did any before/after testing and didn't notice a difference but that car saw a lot of highway miles and likely had very little carbon buildup inside the engine. I got some smoke but not a lot.
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