Question about 1993 Mercury Grand Marquis
The vaccumm motors that actuate the mode doors are vaccumm driven.
if at idle all is ok then under accelleration mode doors change then there is a vaccumm leak in the system. look for a steel can (coffee Can) under the hood. trace the vacumm lines from there.
Posted on Jul 27, 2010
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Posted on Jan 02, 2017
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