I sometimes sputter when I'm nervous. Please reword the question and tell me what year and engine and describe what you are doing with the car when "sputtering" occurs. Would help if you can think of additional description of what you mean by "sputtering".
Subaru Legacy was created in 1989.
Yes, Subaru made the Legacy in 1996.
Yes.
You must be talking about a Subaru Legacy GT and a Subaru Legacy GT spec B. They are two different legacy models and the specs are on the website.
Yes.
The 2002 Subaru Legacy has 16 valves.
The 2009 Subaru Legacy has 16 valves.
The 2001 Subaru Legacy has 16 valves.
The 2004 Subaru Legacy has 16 valves.
The 2013 Subaru Legacy has 16 valves.
The 2005 Subaru Legacy has 16 valves.
The 2011 Subaru Legacy has 16 valves.