Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 305 sbc good idle, Dies when in gear
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Old 11-06-2007, 10:14 PM
1970Chevy 1970Chevy is offline
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Sorry about the confusing post. Im wondering why the vacuum is so greatly affected by shifting into gear. At park the engine idles with 17 Hg" of vacuum. The moment I shift into reverse or first gear, the vacuum drops to 10 Hg". Im just wondering what is happening inside the engine that causes this significant amount of drop in Vacuum?

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