4A-GE MK1 Engine How?

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So i just replaced a vacuum line in my AW11 (orange tube in image below). http://i930.photobucket.com/albums/ad144/tooljst8/NAVacuumlinesorangetube.jpg Basically the tube was there throughout the whole day of driving and for the past 3 months it has also been there. Then all of a sudden after doing highway speeds my car decided it didn