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I'm no expert either, but to me the hissing sounds like its a vacuum leak. Alot of Auto's use vacuum to change so I would start looking in your manual to see what hookup there is for shifting up a gear? I would also get under the car and start looking for rubber hoses that aren't where their suppose to be. And or, a barb coming off the Auto without a hose attached.
That being, that you havent already done this?
what exactly have you done? that might help sort out where your up to.
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