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Q: why does it shake horribly off and on while driving or while at a red light? on 1994 Mercury Sable

it also shifts hard when shifted from park into drive
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these were bad for a vacuum leak on the vapor hose from intake. runs from rear of intake, under air cleaner tube toward front of engine.
uummmm...???? ok, I guess ill be getting a book so I can figure out what and where that it... :)
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