Well when the motor is under vaccum, its trying to squish the tubes, so it would seal the crack. Then once the pressure comes on, the air leaks out, and then your ecu thinks the motor is using the air, and dumps the ammount of fuel for air thats going in, but its not getting into your motor (the black smoke is the extra fuel).
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Yay the supra assistant is gone!!! WEEE!!
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