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How hard is the flapper to move by hand? There's nothing jamming it or making it stick is there? I can't see any way for the flapper to not move at all except for there to be a massive air leak after it some where check your entire intake piping after the afm all the way to the motor, including intake manifolds. I think some one suggested to pressurize your intake? Could have been a different thread but it's a good idea.
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