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While performing a vacuum test on an engine, as the engine's RPM's are raised steadily from idle to 2500 RPM, the needle drops form the original reading to nearly zero. What is the most likely cause for this?

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1. While performing a vacuum test on an engine, as the engine's RPM's are raised steadily from idle to 2500 RPM, the needle drops form the original reading to nearly zero. What is the most likely cause for this?





 
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