Vacuum leaks can be intermittent. A gash in a hose might just need the right twist of the motor in order to spring a small leak. Did you do a thorough check of all the vacuum lines? Wiggle and spray lol
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1986 Honda VFR750 - 89.3HP to the wheel
2000 Trans Am M6 - Mods: Yes.
2026 Tesla Model Y - lol
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