2000 Nissan Frontier

Engine Performance problem
2000 Nissan Frontier 6 cyl Two Wheel Drive Manual 124000 miles

hey I have a frontier I rarely use due to me having a company vehicle but I want to keep up with it and sadly to say it needs a little work done. The idle on the vehicle normally is around 500rpms but since I turned 112000 miles it is steadily at 1100rpms. What could cause this. And what do I need to do to solve the problem.
March 15, 2009.

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