Vacuum leak, Idle air control valve, or dirty mass air flow sensor.
Check all vacuum lines for cracks or disconnection. Replace as needed
Turn on AC and check if the IAC valve cycle the engine to higher RPM to adjust for the AC load. IAC valve can be removed and cleaned..
Mass air flow sensor should be cleaned each time you change your air filter. Remove it from the Air inlet pipe and spray it out with MAF cleaner.
If an alternator is going bad it can cause a rough idle in a 1993 Subaru Legacy. Cold temperatures in the winter can also cause a rough idle in the Subaru Legacy.
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could be the egr valve is dirty and needs to be cleaned. if there is soot build up, the valve may not close all the way which can cause a rough idle. if it ever stumbles while accelerating, that can be from it not opening when it should. cleaning it can be an easy 30 min job that anyone with basic mechanical skills can do. sometimes.
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.
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Yes.
The 2004 Subaru Legacy has 16 valves.
The 2013 Subaru Legacy has 16 valves.
The 2001 Subaru Legacy has 16 valves.