It could be caused by a bad modulater, plug screen or it needs a overhaul
The 2006 Subaru Impreza has a 5-speed manual.
The 2004 Subaru Impreza has a 5-speed manual.
The 2008 Subaru Impreza has a 5-speed manual.
The 2014 Subaru Impreza has a 5-speed manual.
The 2012 Subaru Impreza has a 5-speed manual.
The 2002 Subaru Impreza has a 5-speed manual.
The 2010 Subaru Impreza has a 5-speed manual.
The 2009 Subaru Impreza has a 5-speed manual.
The 2001 Subaru Impreza has a 5-speed manual.
The 2013 Subaru Impreza has a 5-speed manual.
The 2007 Subaru Impreza has a 5-speed manual.
The 2011 Subaru Impreza has a 5-speed manual.