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It lets air into the combustion chamber. You want the engine to be able to draw all the air it can through the carbs to get an accurate reading. If the carbs are closed it's like trying to take a really deep breath with your mouth barely open.
 

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i just tryed both i got 136 with closed n 135 with opend throttle
 

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alot of ppl on here say 100, but my friend says 110, but he also drag raced so he wanted the most
 

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performanc, woo donno how that happined. guess not enough sleep
 
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